Which one of your tanks? Mexican Turbo Snails love GHA. They are bulldozers, and they will knock things around, but they'll get the job done.
I'd add one Mexican Turbo to the 27 gallon, and two to the 75 gallon. At those numbers they should hopefully be able to sustain themselves after cleaning everything up. Basically, one Mexican Turbo for every 30 gallons. I have two in my 10 gallon display, and I need to supplement them with nori. There isn't a spec of nuisance algae in my tank: with the exception of a little bit of GHA on one of their shells.
Not sure about your lighting question.
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Shelley
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