The two Dwarf Gourami's in my tank poop ALOT. I try to be conservative with my feedings but two days after I vaccuum the gravel there will be what seems like a lot of poop laying on the bottom again. I do 40% water changes by vacuuming the gravel every 7 days and rinse out the filtre media at that time. How often can I vacuum the gravel without upsetting the bacteria there too much? Also, I see a product called Waste Control in my LFS. Is this effective and would it have a negative effect on my fish? I prefer to put as little as necessary in the way of chemicals into the tank.
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