Don't buy a hang on back filter and if you already did plan on upgrading soon to a canister filter or refugiums. You want something with a pump rated at at least 450 gph. If you don't have a Test kit yet.. Buy a API master test kit. They're about 20 bucks and extremely useful. Especially when cycling a tank. If you don't already have one buy a gravel vacuum siphon. And also a few 5 gallon buckets dedicated completely to you tanks. Because if you have all your equipment for maintenance more accessible, then you will be more willing to do it.