I would try washing the gravel off with bleach first to kill the moss that may be hiding in it and then rinse them off extremely well before putting them back in the tank...then once you get the tank set back up and ready for fish, let the tank operate for several days to get the filter activated as well as allowing time for any "leftover bleach" to evaporate before you add the fish back in.I have 2 10gallon freshwater tanks one downstairs and one up in my room jsut because I love looking at them and hearing them. I'm actually trying to fix them up tonight and saw this thread here earlier so I came back.
So the one upstairs is about to look fantastic because the one downstairs needs to be taken apart almost completely. The plants started getting this moss all over them and died.. and the moss spread everywhere. Taking the moss out does no good because it grows back extremely fast. So I threw the plants away and right now I'm moving the fish upstairs. I need some suggestions on how to fix the bottom one. I'm going to take all the gravel out, put it all in different small jars and just rinse them all for a long time, then do the same with filter. What else do I try?