I personally would add a HOB
, if it was my choice, just after having had UGF
's in the past, and like Bearfan, not enjoying the "sewage" (perfect description!) that stays under there. At some point you would have to deal with said sewage, and some get a syphon started with a long piece of airline tubing and suck out the gunk, but if you have the opportunity, before things get settled, I would switch it. You may have a mini-cycle result from the disturbance of getting it out, but better now than when you have a carefully selected community of fish in there.
There is certainly nothing wrong with keeping it in there, and using it as your filtration, as many do this and have done this. You can put a powerhead on the uplift tube and run it in reverse as reverse flow UGF
and get a small HOB
to supplement, and then you won't have to worry about the trapped particles so much. Coin toss!