Posted: Wed Jun 16, 2010 10:16 pm Post subject: Re: Skimmer advice
Thanks for the info Nirav...
This below is only from what ive read.
The DSB works on the basis of denitrifying Anaerobic bacteria that live in an oxygen depleted envioronment deep within the sand bed (Hypoxic/Anoxic layer). Only they have the ability to convert nitrates to nitrogen. Any deeper and its the (Anoxic/Anaerobic layer) where bacteria convert Sulfate to hydrogen sulphide. Anything above is the oxic layer, where only bacteria that can convert N02 to No3 thrive. The key to the thriving of the Hypoxic anoxic layer is the critter/worm population that sifts the sand and eats up the detritus, and also helps avoid compacting.
From my understanding most of the bacteria in the LR would be under the oxyic category. The Hypoxic/Anoxic bacteria would be very few in numbers to convert nitrates to nitrogen, as the deeper areas of the LR arent as good a medium for propogation of the required bacteria as the Hypoxic/Anoxic layer of the DSB.
Since Weylin doesnt have a Turf scrubber, nor Chaeto nor any other macro algae, nor mangroves, nor any other source of nitrate reduction, i thought he must have a DSB. I dont think LR will reduce the nitrates so low in a tank where water changes are done once in 2 - 3 months, plus a lack of skimmer, and a heavy bioload helps up the nitrates faster. Or is it because of the light feeding? And ive seen welyins tank and its awesome. So I was kinda confused.
This also brings me to the tiles you used. They would support oxyic bacteria, but probably not the anaerobic ones. Same like using ceramic rings, which would cause nitrates build up and not reduction.
or do I have my concepts mixed up or missing something?
Posted: Wed Jun 16, 2010 10:40 pm Post subject: Re: Skimmer advice
Any Medium that will receive deepleted oxygen water will grow Anoxic bacteria. The same concept applies in coil based Denitrators and deep inside Live rock. If you have good quality live rock that is extremely porous you can definitely control nitrates very very easily. The same reasons why fiji and tonga live rock is famous across reefers around the world. Most reefers will pay a stiff price to procure the same as well.
The idea of tiles i got from someone in UK who uses ceramic bricks/blocks very efficiently for the control of nitrates. This reefer gave me the idea of using tiles and the method. Basically this lies in one of the chambers in my sump which is after a chamber containing a very large volume of bio media, basically LR rubble, ceramic rings and bio balls. Water from this chamber enters this small chamber where the tiles are present. Since the water than enters this chamber does not trickle it has depleted levels of oxygen which will thrive the growth of Anoxic bacteria in the very fine pores of the tiles. Ceramic rings have larger pores and hence anoxic bacteria do not grow in them.
Your concepts are right, its just that using those concepts if you are able to utilize them more efficiently to form an ecosystem. Since i divert most of my time on private research and usualy do not stock my aquariums with live stock in which i experiment, i get to try a lot more things. Infact I dose nitrates to the tank to see how these perform.
Posted: Thu Jun 17, 2010 12:09 am Post subject: Re: Skimmer advice
Every time i look at my fish, their stomachs are nice and plump, they are always feeding on the pods in the tank..
So i feed them pellets once a week just for extra nutrition and since my tank is a nano, i don't want extraordinary growth rates..
I don't have a dsb and i purchased about 3 kgs of LR out of which i gave one rock to sid.. So there's hardly any LR, but in the sump i use porous rocks about 4 pieces.. some sand in the fuge(which now holds sun corals, zoanthids, mushrooms, BTA, Sand Anemone and a pair of perculars)
I have about 8 Pistol shrimps which clean up my sump and also add extra food for the fish(they breed from time to time)
There's nothing great about the setup, and i don't do much with it..
The only thing i do switch the lights on and off and clean the glass every 2-3weeks...
Posted: Thu Jun 17, 2010 11:35 am Post subject: Re: Skimmer advice
I do not have a sump currently for my 90 gallon FOWLR. But have LRs and also have a canister.
IF I fill the canister with LR roubles/ceramics rings completely, would it help in nitrate reduction?
Nitrates currently hovering constantly at 20ppm post the disaster in my tank.
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