scalesandfins;4637919; said:your to quick, but thats good.
i figured 4 would be too much. n i am realisticly shooting for close to 10x turn over. my 120 has about 1000 gph on it and it stays crystal clear. so do you think i could do like 2000 gph and it still stay crispy as some would say?
oh and whats the diff between external pumps and submersables?
2,000gph would still be plenty, at least in my opinion.
Nothing really different, they both pump water. All of my Quiet One and ViaAqua pumps can be used either submersed or externally. Some can only be used one way or the other, so keep that in mind. Typically external only pumps are larger and submersible only are smaller, ones that do both tend to be middle sized.
And like Pharaoh said if plumbed right an external pump shouldn't leak but I just prefer to eliminate that possibility by running them in the sump.