Powerheads...What size?

[dpotts]

My 90g build is slowly progressing and so now I'm ready to add some powerheads. I want to get two and have one on each end of the tank. I want to use Koralia powerheads and was wondering what size should I use?

[Kristy]

We used a pair of K4s on our 100g and were pretty happy with the flow once we played around with the angles of it, bouncing off the front glass with one, etc. I always think there is pretty much no such thing as too much flow, so I'd say go with no less than K3s, but you would probably be happier in the long run with a pair of K4s.

Probably also depends on how much rock you will have in there, how open the tank is, come to think of it.

[msmith619]

I have a 75 gallon with a K4 in it and wish I had bought 2 k3's. The flow is good but often kicks up the sand half the tank away even thought the k4 is at the top of the tank and flows straight out. I has blown corals off the rocks on the other side of the tank. I LIKE a lot of flow but should have spread it out to another, smaller korella.
Mike

[Kristy]

I have a 75 gallon with a K4 in it and wish I had bought 2 k3's. The flow is good but often kicks up the sand half the tank away even thought the k4 is at the top of the tank and flows straight out. I has blown corals off the rocks on the other side of the tank. I LIKE a lot of flow but should have spread it out to another, smaller korella.
Mike

Mike,
Have you played with the angling of the K4? Tried bouncing it off the front gl***** How much rock do you have in your 75? Just curious...

[jc]

Ask around if anyone has a koralia that you could borrow. That way you can see how strong it is in your tank.

[Robb_in_Austin]

I have a K3 I'm not using if you want to borrow it.

I had 2 K3's in my 58, pointed at each other, and got a nice amount of mixing flow. I eventually went with a K2 and a K3 just to tone it down some as well as get a tiny amount of circular flow throughout the tank.

[Firstman]

I have two k3 in my 90 gal. there alright go with k4 or even a k6 that will be better 90 is alot of tank you do need movement