08-20-2012, 10:21 AM
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Appear's to be a powerhead with attachment probably holding foam on bottom.
Does appear to be quite powerful for the goldfish,especially fancy ones that due to their shapes,,waddle, rather than swim as freely as would more streamlined fish.
Goldfish are also serious waste producer's and volume increases with size/age of fish.
For this reason,, I would select a canister filter for this tank, for the added space for biological media(ceramic noodles,,sintered glass,,etc).
Ehiem 2213 would be my choice or a couple of Hang on the back Aquaclaer 70's one on each end of the tank.
Would leave the bottom portion of the current pump (Foam part) in the tank when placing new filter(s) on this aquarium, for this part will house a good portion of beneficial bacteria and would remove it only after four week's or possibly stuff it in the new filter if there is room.