Thanks again for reply.
I have both run on the low flow for 2days. then I saw the fishes can't tolerate both filters flow rate on both side. Goldfish need to have slow flow and hanging on bottom resting when light off.
I decided to throw all filter media from Whisper to AquaClear 500. This morning, I can see the water clear up and fishes run happier.
I ordered some Bio-balls and will let it flow on top of the AquaClear
I have both run on the low flow for 2days. then I saw the fishes can't tolerate both filters flow rate on both side. Goldfish need to have slow flow and hanging on bottom resting when light off.
I decided to throw all filter media from Whisper to AquaClear 500. This morning, I can see the water clear up and fishes run happier.
I ordered some Bio-balls and will let it flow on top of the AquaClear