Hey everyone! I just want to say that I'm new here, but this seems like a great community, and I can't wait to start getting to know everyone here!
Anyway, I'm a first-time fish owner, and right now, I have my first 10-gallon tank with 2 fish. One is a koi, but I'm planning to give it to my uncle around Christmas, and one is a golden fantail. The koi is about 3 and a half in. long, and the fantail is 3 in. long, not sure how wide though. Anyway, I have a 5-15 gal. Whisper Filter that came with the tank, and one tank ornament and a fake plant. I went to the pet store and bought this solution that's supposed to make any bacteria floating in the tank that's too microscopic for the filter to pick up (since i originally suspected that there was bacteria in the tank). That worked... for a while. Now, the problem is, the water seems a little bit cloudy when I turn on the light, and some rocks, particularly those toward the back of the tank that the fish don't move around much, have this brownish stuff growing on it. Some of the rocks even have a slight green fuzz on them that waves around like grass... it's kind of gross... and there's also brown stuff coming up the sides of the tank and the back. I do weekly water changes, and I don't overfeed. Also, the light is off for most of the day, it's on maybe 5-6 hours at the most. And I'm afraid to get any plecos because I heard they attack the goldfish sometimes... and no snails either, because they reproduce too quickly, and also, I don't have any live plants for them. Any suggestions?
Thanks!