Hi - I'm new to this forum so not sure if I'm supposed to post a question here, but I fell into the trap of purchasing a Glofish tank at PetCo. Hadn't done any research before doing that. I have a 5 Gl tank with 3 fish. I have blue lights and the artificial plants - looks pretty - fish seem healthy - but I have black mold growing on some of the plants in the tank and wonder if I should change them for real plants if that's even possible. The gravel is the stuff that came with the "kit". I've owned fish before very successfully - had a 25 Gl tank freshwater, but I'm in a small apartment now and thought a smaller tank would be ok. Also, I am not sure if I'm overfeeding my fish - I feed them flakes and they have started to come to the surface to feed, but a lot of it floats around and then sinks to the bottom - so my water gets cloudy often. Any thoughts or suggestions would be welcome.