im really nervous about cleaning my tank. as my other post mentioned.. i was landed with this tank and a lonely red eye tetra just yesterday. i don't know much about this hobby. but i do know that this tank is really grungy looking and the water is cloudy. im really tempted to take out the fish and totally clean the tank. gravel, plants, and filter. but im just not sure if that a sure way to kill the fish. am i to understand that some "grime" is good? is it a good idea to clean everything? .. or should i just leave the decorations and change the water?