We've got a 29 gallon tank. It's been running for about four weeks and we've had about four weeks. We had a bad run of some sort of parasite and lost all but our angel fish and shortly after the water went cloudy and within a matter of a couple of hours we had a white film all over the glass and plants (they are fake). We took the angel fish out and drained and cleaned everything in the tank and refilled it. It ran for about twenty hours and then the same thing happened. We didn't clean or change the gravel so I'm thinking maybe that was the problem. The fish seems to be fine and all the levels are normal,
pH is a little high (about 7.5) but we are basically re-establishing the tank. Not sure exactly what everything else is as I used my last test strip and need to get some more. I will try and attach a picture if I can figure out how.