Do i need an underground filter?
So i'm slowly building my 46 bow front tank (as $$$ permits) and i'm going to use a MarineLand Penguin Bio Wheel 200 power filter (i use these with all my other tanks and never had a prb) i plan to use sand/gravel/live plants in this tank (this is a 1st for me) do i need to use an underground filter also (i have these in my other tanks as well)
No an under-gravel filter should not be necessary.
Adding to what has already been said, it is now fairly common knowledge that undergravel filters are becoming a thing of the past.
They can be difficult to maintain and can cause serious swings in water parameters if not maintained properly.
Under gravel filters (UGF) can still be effective bio-filtration but require routine, if not religious, gravel vacuuming to prevent fouling. In some respects, reverse flow UGF's are better. In some respects, as Taz points out, UGF's are 'old school' in favor of todays power filters and medias. AND if rooted plants are in the short/long range plan, a UGF would be best avoided.
As a matter of fact, having used both gravel and sand, I'm sold on sand and would use sand instead of gravel.
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