Hey there,
I would reccomend the fluval FX5. It is large, but small enough to fit under the aquarium if you have the aqaurium on a proper stand. It is powerful and you may have issues with strong current, some things you can do to alleviate this is to put the intake and output at the bottom of the aquarium half covered in large rocks (it says not to put them this far under the water, but as long as the filter itself is below the tank you are fine). The filter is almost completely silent and I have a hard time telling it is on unless I hold my hand to it. The filter is rated for like 400 gallon tanks so it is more than adequate and provides for a more hassle free upkeep with fewer water changes. It is self primed, but I still recommend priming it by adding as much water to the canister before re-attaching the hoses. I have been using this filter now for about 9 months, and my dbt's started as 1-1.5" babies and have not had any problems with current and are actually better swimmers for it. All in all I rarely ever have to deal with water quality and if I do it is usually as simple as adding a different kind of filter media to the middle basket (clearmax,peat,zeo-carb,lab series opti-carb). I do 25% water changes about once a month, and like I said for the most part my chem and water quality levels are perfect. The filter is dead quiet and my system is very maintenance free.

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