I've seen the plant that I guess is a moss that free floats at the top of tank, and I want to get some... Whats it called and how difficult is it to keep alive?
Are you referring to Riccia? It is often seen floating in tanks. If left to float, it is easy to grow; as it is close tot he lights and takes nutrients throughy the water column. Riccia is not a moss, but can look like one in thick clumps.
