I have a Coralvue 20k 150W double-ender for my 20g.
It's OK. It's not as blue as you'd think (I actually supplement it with 2x75VHO actinics!). It's bright, but its .. well it's 150W. It's a good lamp for a small tank like a 20g but you couldn't expect to do much more with it, I think.
If you're interested come on over sometime and take a look, I can fire it up for you. Only thing is my 20g is .. kind of decommissioned after my recent move but I hope to get it up and running again within a week or so.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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