First off welcome to AA! This site is packed with knowledgable aquarists who love to learn, educate and have fun doing these things!
The first thing I would like to recommend to you would be to change your method of filtration. I would upgrade your Hang On Back (HOB
) filter to an AquaClear or 70 or a Fluval canister filter, or both
your magnum is more of a water polisher rather than a filter, so I would step up to the AC70 for more efficient biological filtration to kill that ammonia on the spot. And it could be the ammonia that clouds the water.