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Sump is more economic and efficient for large tank, recommended.

Water pumped up and flow back down, water level in tank is steady and water refill and change can be done in the sump.

A submergable return pump don't cost much for 90g, but make sure it sits balance and reduce unnecessary off center rotary vibration, because most common problem is this unbalance vibration will shatter the ceramic disc(holding the shaft) inside, and reduce pump life.

I use a lot of polyester fiber for gravity filter media, those pull out from old sofa, cheap and effective, a lot of surface area and don't need any bio ball or whatever, but need to clean the polyester fiber every other week because it tends to clog. (I only clean half and another half next time, so bio filter will keep working)
 
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