I may split the 20 gallon into 3-4 sections. I plan on changing the substrate would doing so mess up my cycle?
Right now I use plain gravel with crushed coral mixed in with it. I also use peat to lower the PH. Once I get the tank divided I want to use different substrate. I'm thinking some sort of sand and whatever else. I don't want to use anything that will leach ammonia into the tank. What other substrates can I get?
For filtration I'm looking at the Oxygen plus bio-filter 2. I think I can rig it so there is 1 sponge on each side of a divider. Will that be enough filtration or should I just grab 4 of the filters? Also since I am dividing the tank how will I keep it from going into a cycle? I will have the old filter I can still run, but it won't filter all sections. I may rig a contraption for the HOB filter.