I have found it is important to get a happy medium between crystal clear water & bacterial health I have a 1900L/Hr filtration in a 200L tank. this provides very clear water but i do not scrub the back wall or submerged fittings, ie: the hood filter power head, canister spraybar etc. they do have small amounts of algae growing on them which keep my BN catfish employed. I also have 2 large clown loaches & 2 skunk loaches that do an excellent job of keeping the bottom free of excess food therefore maintaining a stable water condition. this may be wrong in other peoples opinion but my fish are all healthy with excellent growth & are very active.
Smidey
PS: a bit of algae on the back wall also stops alot of reflection, I have a dark blue background which can create a mirror effect.