I use a submersible filter hidden behind some driftwood, but after realizing how difficult it is to access the filter for routine maintenance, I am looking into a canister filter. I have heard good things about several of the canisters out in the market, and there are plenty made for a tank your size. Canister filters are the most efficient, easiest to care for, and def a lot less of a hassle than other types. The availability of spray bars will also reduce the flow in your tank as opposed to the flow a HOT or other types of filters can produce.