an iwasaki beside a radium isnt fair
obviously the raidum will be bluer. anyways, i run 250 iwasakis and with two vho the tank looks white. you'd be amazed how much of a difference the vho makes.
i agree with john, 4 vho's make it looks like the left side... i have thought about adding two more but it isnt "nessasary" so it gets bumped to the back of my tank wish list
a 250w Iwasaki is more intense than a 400w radium IMO. just for brightness sake and i like that..
i have seen radium/iwasaki combo tanks and they look good when the colour mixes properly