your lps is given bad advice
there is no system that do not have to be cleaned
the refug still has to be cleaned and the sand has to be changed every few years
you would change 1/3 at a time.
there still should be some kind of mechanical filtration such as floss or pads
as far as hooking it up if you do it wrong it could be a realy problem
not that it is hard to do just make sure u research it first.
the pump on a 90 gal with fish only a good pump would be a quiet one 4000
I ran that on my 90 for 5 years with no problem
it about 900- 1000 gph
another good pump is the mag 7 or 9.5
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