bjhubb

I am looking at getting a couple of water pumps to help with my lack of water movement. I have been looking at the Hydor Koralia pumps. What combination would be best for my 75 gallon salt? I want to have a moderate water flow. I was thinking about 2 Koralia pumps, one on each side pointing down and across the tank. What size of pumps do I need? They have 400gph, 650gph, and I think 800gph.

sgould

In planning circulation, shoot for a minimum of 20x your tank volume in total circulation, though more is fine.

NirvanaandTool

The Koralia's are pretty good pumps. I have 2 in my tanks - a Knano in my 35g and 1 K2 in my 55g.
My only complaint with them is the bigger ones stick out alot in the tank. The K2 sticks about a good 6-7" inches from the side of the tank whereas my Tunze 6025's only stick out about 4".
I would probably do 2 K3's along the side of the tank - this would give you 21.3x flow in the tank. Or you could do 3 K2's (1 on each side and 1 in the middle) for slightly more flow. This could also help you minimize any deadspots in the tank. All up to you

au01st

I'm planning on 2 K3s in my 75 with a spray bar on top running from a Mag7 in the sump. This will give me appx 2000 GPH circulation, where as 20x calls for 1500 gph. Will that be sufficient, or too much?

fishrule101

I think that will be ok. I'm planning on buying me some. I have the regualer power heads and the waste and other stuff get stuck in the umm.... protecten thing so it reduces the power flow. I'm planning to two on one side and one on the oppiste side. One will point up so the water surface can move.

sgould

Sounds like a good start...certainly not too much. Basically as long as you aren't kicking up sandstorms with your current, or blowing the scales off the fish, all is well.

galvatron3000

I have the Magnum 6 that recently came out alone with the reg. #4 both on opposite ends for a 210 gal. I think they are great

NirvanaandTool

Sounds perfectly ok. About 26.7x flow. Tank should definitely be fine with that amount.

au01st

Great! I actually decided to hold off on the Mag7 and spray bar. I'm going to use 2 marine bilge pumps that we calculated to roughly 250gph each at the head (about 5 ft). So, both lines from the pumps have check valves and ball valves, send 500gph to the top into a y-fitting inside the tank, then 2 flexible arms with 2 flare nozzles. This will be in the center pointing down the front of the rock/reef. 2 Hydor Koralia powerheads will be in the corners of the tank point toward the front of the rock/reef. This will mean that there's no direct flow pointed at the rocks themselves, but will be hopefully rushing by and create a nice turbulent flow, and will still give me around 2000gph (if the Hydors don't flow max rate, if they flow max, then around 2200gph flow).

BTW, picked up the 20gallon for my sump yesterday...getting excited...still doing tons of research, but I think I about have a fish list picked out.