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http://indianaquariumhobbyist.com/community/ :: View topic - Scum in CO2 diffuser
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Scum in CO2 diffuser

 
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msghael
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PostPosted: Sun Aug 10, 2008 9:45 pm Post subject: Scum in CO2 diffuser Reply with quote

 I  am  using  a  Dymax  diffuser  in  a  4'x2'x2'  tank  with  CO2  @  approx  120  bubbles/min.
 Water  ph  is  7.2  and  kdH  =  12.
 
 The  diffuser  internals  soon  get  coated  with  a  brown  slime.  The  tank  is  dosed  using  PMDD  is  free  from  algae  (Touch  Wood).  Photograph  below
 
 
 
 If  the  difuser  is  dismantled  and  cleaned  the  coating  begins  to  form  in  the  top  compartment  (which  is  connected  to  a  powerhead)  within  a  few  hours.  It  slowly  coats  the  inside  of  the  wholw  diffuser.
 
 Could  the  experts  please  confirm  is  this  normal  and  what  is  this  scum.
 Thank  you  in  advance
 Maninder
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Prem kk
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PostPosted: Sun Aug 10, 2008 9:49 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 Hi  Maninder,
 
 I  used  to  face  the  same  thing,  but  never  noticed  that  it  forms  back  again  in  few  hours.  I  usually  clean  it  every  month  and  never  faced  any  issues.  I  just  hide  it  behind  all  the  plants  so  it  doesn't  look  clumsy.
 
 Cheers,
 Prem
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Seetharam
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PostPosted: Sun Aug 10, 2008 9:56 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 I  face  this  same  thing.  IMO  its  the  scum  in  the  water  which  is  pumped  through  the  powerhead  that  forms  as  a  deposit  on  the  inside.
 
 I  would  suggest  that  you  fix  some  sponge  on  inlet  of  the  powerhead  to  reduce  the  muck  getting  inside.
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natbox
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PostPosted: Mon Aug 11, 2008 5:49 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 is  it  the  muck  or  brown  algae?  Smile
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msghael
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PostPosted: Mon Aug 11, 2008 7:43 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 Hi  "natbox",
 Now  that  you  mention  it,  it  is  brown  in  colour  and  slimy.  I  can'tt  see  it  any  where  else  in  the  aquarium.  If  that  is  brown  algae  has  it  anything  to  do  with  the  dosing  rate  of  CO2  ?  Is  it  possible  to  get  rid  of  it  ?  This  seems  to  be  the  experience  of  others  as  per  their  posts.  
 
 Maninder
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natbox
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PostPosted: Mon Aug 11, 2008 8:06 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 i  suppose  its  a  co2  unit  you  are  using  ...i  mean  a  co2  cylinder....because  i  observed  that  this  arises  when  there  is  a  imbalance  in  the  co2  levels  inside  the  diffuser  i  mean  the  co2  flow  as  well  as  cleaner  water....water  changes  must  do  the  trick..anyway  careful  with  it  ...dont  use  hands  to  clean  it  because  i  once  fell  ill  after  cleaning  it  with  my  hands  ..got  some  into  my  fingernails  as  well  as  some  nicks  in  my  fingers....a  very  high  fever  that  raged  for  about  3  days  .....even  now  i  do  it  with  my  hands  but  i  get  blisters  and  others  than  fever  ..  Very Happy  guess  i  am  immune  now...anyway  sorry  to  go  off  topic...do  the  water  changes  and  check  out  co2  flow  ....
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natbox
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PostPosted: Mon Aug 11, 2008 8:13 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 http://freshaquarium.about.com/cs/maintenance1/p/algaebrown.htm
 this  link  must  help  you  out  ....have  fun  and  post  updates  ...  Thumb Up
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kk27
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PostPosted: Mon Aug 11, 2008 10:38 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 I  face  it  too.  
 
 rgds,
 Kaushik
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msghael
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PostPosted: Tue Aug 12, 2008 5:47 am Post subject: Re: Scum in CO2 diffuser Reply with quote

 Thanks  "natbox",
 
 Visited  the  site.  The  reasons  for  brown  algae  listed  are  :
 #  Excess  silicates  &  nitrates
 #  Inadequate  light
 #  Low  oxygen  levels  
 
 My  observation  /  inferences  are  :
 #  I  haven't  tested  for  silicates  
 #  Nitrates  are  <  20  ppm.  Well  within  control.
 #  Though  I  am  using  236  W   lighting  in  100  g  tank  (2.36  w/g)  the  intensity  of  light  in  the  Dymax  diffuser  must  be  much  less  than  in  the  tank  because  of  it's  rather  deep  green  colour.
 #The  oxygen  must  be  low  in  the  diffuser,  specially  at  the  top  because  the  CO2  collects  at  the  top  and  this  is  where  the  deposit  starts.
 
 What  is  the  experience  of  others  using  a  clear  diffuser  and  adequate  light  so  it  removes  another  "triger"  for  the  brown  algae.  A  point  to  note  is  to  observe  whether  the  deposit  moves  down  as  the  diffuser  fill  up  slowly  with  time  and  the  small  power  cuts  we  have.  
 
 The  replies  and  observation  will  help  in  deciding  whether  to  use  more  than  1  diffuser  in  parallel  to  avoid  accumulation  of  CO2  and  /or  to  change  the  diffuser  to  a  clear  type.
 Regards
 Maninder
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natbox
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PostPosted: Wed Aug 13, 2008 3:42 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 sorry  for  the  late  reply  ..but  based  on  my  experiences..i  believe  a  greater  water  flow  helps  in  dissolving  more  co2  as  thereby  increasing  oxygenation  in  the  diffuser  by  a  margin  ...connecting  two  diffusers  in  parallel  wont  help  matters  as  it  might  reduce  the  flow  of  water  ...
 as  for  using  a  clear  one  ..the  one  you  are  using  is  better  ...clear  ones  show  the  algae  clearly  making  it  kind  of  a  aesthetic  disturbance  .....IMO  ...i  never  care  for  aesthetics  ..all  i  want  to  provide  is  a  good  home  for  my  fishes  ...(thanks  to  venkat  for  giving  me  that  ideology  Very Happy  )
 as  you  must  have  noted  that  brown  algae  is  slowly  eradicated  by  other  algal  types  such  as  the  green  algae  ..so  let  it  be  there....
 i  believe  even  tom  barr  once  said  that  he  does  not  surely  know  the  exact  reasons  for  algal  growth.....
 dont  take  drastic  actions  for  algal  control  ..it  ll  gradually  settle  back  to  your  cycle  ..try  those  fishes  as  mentioned  in  the  link  ....plecos  are  a  good  and  cheap  option  i  must  say   Thumb Up
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msghael
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PostPosted: Thu Aug 14, 2008 5:01 am Post subject: Re: Scum in CO2 diffuser Reply with quote

 Thank  you  "natbox",
 I  will  wait  &  see.  I  have  added  2  sma;;  plecos  and  they  are  busy  not  only  on  the  glass  but  also  occassionaly  on  the  plant,
 Maninder
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natbox
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PostPosted: Thu Aug 14, 2008 3:19 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 i  turned  off  the  co2  and  guess  what  ..my  diffuser  became  crystal  clear   Chuckle  all  that  brown  algae  vanished  into  oblivion   Thumb Up  but  still  i  use  DIY  co2  thats  why  ..i  guess  they  ll  grow  back  once  i  start  co2  diffusion  back  again  Sad
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msghael
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PostPosted: Sat Aug 16, 2008 1:02 pm Post subject: Re: Scum in CO2 diffuser Reply with quote

 Hi  "natbox"
 You  have  apparently  proven  that  the  deposit  is  brown  algae  and  is  caused  by  lack  of  oxygen  in  the  diffuser  (result  of  high  CO2  locally  in  the  diffuser.  Not  low  light  as  the  light  was  the  same  when  you  stopped  CO2  injection  and  the  algae  vanished.  
 IMO  that  in  the  main  tank  the  oxygen  is  high  and  the  brown  algae  does  not  get  the  unbalanced  inputs.  Thank  you.
 Regards
 Maninder
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