Water flow in a marine fish tank

Question

I have four powerheads in my 100 gallon tank. However, there seem does not seem like enough water flow. Some of my corals are happy, but some appear to look like they are dying. Does anyone know of a good marine website or have any suggestions as to what direction the power heads should be mpointing in

Answer 1

well try and put them at different hieght one at the top one mid way and low bottom and the oter right at the bottom i had the same problem  this worked for me as there was different levels of water moverment

Answer 2

try this site

http://www.justmarine.co.uk/

good luck