1. The T5 set is adequate, depending on the plants you want. Demanding plants like Glosso would probably do well with the MH.
2. I find the 501 barely adequate for a 1.5 footer, let alone a 2 footer. You're better off with an Eheim Classic 2213. I find the 501 gets choked up pretty fast and the flow rate slows down a lot over time.
Hope that helps.
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