Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have used Peat moss by itself in a tank, and it was not fun. It sinks as long as there is no water movement, or only a small filter, but every tine I cleaned the tank (not gravel vac (peat moss vac?), just a water change and a quick swipe at any algae on the front glass) the peat drifted back up into the water. Then there was a rim of peat moss at the water line, while most of it sank back down over about 24 hours.
I have peat moss in several filters. Not a problem.
I have a paludarium with peat moss and carnivorous plants. Works just fine.
It simply does not work too great as an only substrate in a tank. Fine for Killie breeders, and others who want it for specific fish, it can be worked with, it is not THAT bad. Just not for me.
As for using some under other substrates, I have heard of using it just as enough organic matter until the tank starts generating its own. This happens pretty fast, so a light dusting is all it needs.