Darren, I found your lighting set up :)

[Delphinus]

IMO if sunlight causes a nuisance algae bloom in a tank then something in the system is out of balance.

Seriously, the only reason I don't suggest that we all run out and put our tanks in full direct sunlight, is on account that we're more likely to cook our tanks than anything else; if we don't put into place some serious tank cooling.

Some coral prop outfits and wholesalers are in greenhouses where there may be MH lighting but it is supplemental at best. If you're ever in the Detroit area you HAVE to pay Tropicorium a visit. This place is so neat! It's basically a greenhouse the size of a smallish garden center, but instead of plants, it's full of tanks with corals under various stages of captive-prop. When I was there I was soooo tempted to buy some of their mangroves, but I chickened out on account that I don't know if it's legal to carry mangroves across the border (no idea if they're on CITES or not ... wasn't worth the risk of not knowing.)

But I digress a little, whoops, sorry :rolleyes: ... sunlight in and of itself shouldn't cause a bloom. If it does, then something else needs to be looked at. It may, however, risk heating a tank to unacceptable levels, thus it should not be attempted without a well-thought-out plan.