Water Movement

I'm using two Hydor Koralia #3 powerheads (each rated for 850 gallons-per-hour) from my old tank to provide water movement in the main tank. I have removed the flow restrictors from both units and I'm happy with the amount of flow they are generating.

In the refugium I'm using a brand new Hydor Koralia #2 powerhead (rated for 600 gallons-per-hour) on one side of the tank.

Some additional flow is provided by the return-pump (a Danner Supreme Mag-5 rated for 500 gallons-per-hour, but which is achieving something closer to 350 gallons-per-hour because of the head-loss).