Hi- am new to aquariums and have a 29 gal tank that was given to me complete - has 2 mollies, 3 catfish and a couple of tetra-like fish. the problem is - the tank has had off-the-chart high ammonia levels from the day I got it. It has an undergravel filter and a AQUAEL UniMax Pro Canister Filter that I can't seem to find any info on so I added a hang-on-the back filter about 5-6 weeks ago. I do frequent water changes and vacume monthly and the levels have remainded consistently high. It also has aqua gems plastic substrate gravel - could that be the problem - does this stuff allow for a decent bacteria growth? I had used ammonia lock at first but haven't lately - how long does it take for ammonia lock to wear off? Any and all advice is welcome as I am at a loss to figure this out. Thanks so much!!
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