+1 to Rhinox on the dual AC110's.
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However, the intake 'skimming capability' of the Tidal 110 is interesting (Disclaimer: never owned a Tidal 110, dunno how well the skimmer thing works...). One thing that used to really annoy me when I had a 110G 'XH' Mbuna tank, was this surface layer of 'bio-film' that always seemed to be swirling and moving around up there.
NOTE: If you don't know what I'm talking about, take a look at the underside/water's surface of a heavily stocked tank without skimming filtration (or live plants). Yes? And sorry man, once you see it - you just can't UNSEE the thing!
So anyway, in the upgrade process to a 150 gallon tank, the overflow (skimming) intake of the sump filtration just killed off that annoying surface slime layer - no problem.
