Welcome. First you are doing well so far. Researching first, then go slow. Nothing good happens quickly in this hobby. Lots of equipment to review. Some things you can go budget friendly and have plenty of success; power heads & lighting as examples. Other items you'll definitely want quality; return pump & skimmers.
As for preferences, everyone really has their own regarding over flows, sump set up, etc.
You can get an idea of your sump set up plan and then choose a size tank as opposed to the other way around.
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90g Mixed Reef
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