03-11-2010, 12:07 PM
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In my soil based very heavy planted 10g spawning tanks I don't use any filtration or air stones, I keep yellow shrimp and pond, rams, trumpet snail and a pair of Betta splendens in it until they spawn and I remove the female then the male once the fry are free swimming, at that point I will have roughly 100 or so fry in that tank for 3-4 weeks and all is fine, I do however, have the warm and cold spots in the tank from the heater and lights but it has not caused a problem for livestock or plants. Without water flow not much you can do about the warm and cold spots that I am aware of.
Once plants are actively growing and you have enough of them they will work as the filtration system and use the ammonia before it will convert and often you will not even have nitrate reading because of this, however, this is on soil based tanks, I am not sure how it works with gravel or sand only substrate planted tanks, the decomp in the soil plays a role as well in my systems.