[serreid]

I have a 90 gallon reef tank and I think I need more movement. What do you think about the Korela powerhead and what size should I get or should I get some other type of power head to go the opposite way of my return pump?

[glampka]

Do you mean the Hydor Koralia ph? They move a lot of water & use very little power. Ideally what you are looking for is no dead spots in your tank - I'd get either the 2 or 3. I think the #4 would be too much current. What do you have now for a return pump?You don't want so much current that the fish can't swim against it or that the corals are getting blown all over the place.

[serreid]

Yes I do mean the korelia 4. Currently I have a reeflo external pump that has a pretty good flow to the inside of the tank but my tank is an all glass with a built in over flow box so my return line only goes to one side of the tank.

[RyanG]

You can look here for a full review with video:

Reef Builders Blog about saltwater fish, Marine Hobby & Aquarium » Blog Archive » Hydor Koralia Full Review