So I just took in a 20 gallon tank that my sister neglected/stop taking care of when she moved out. Right now I've got is a the 20 gallon tank with about 30 pounds of gravel I think and some with a fake plant . Its got a Tetra Whisper EX30 power filter that needs a new filter with a 100 watt heater. I was wondering if all that caked on dried on grime; which I worry about it rotting producing excess about of ammonia. Fish wise it has only has 2 Tiger Barbs right now; the rest when to the big fish bowl in the sky. I wish I could add a betta fish but of course the Tiger barbs (especially in small numbers) are fin nippers. Right now the first things I need is a water test kit, a five gallon bucket, and a filter. I could use some feed back on what the next step is?