I'm thinking seriously about modifying my orchid humidity trays by setting egg-crate louvers such as are used in recessed lighting on top of the aluminum pans I have instead of using pea gravel. This would lessen the chance of algae build up and the louvers are easier to clean or so says my 'Orchids for Dummies' book. Does anyone know of a source for some metal ones? I looked at Lowe's and Home Depot but all they seem to show are the plastic ones and I don't know if they'd be strong enough. I guess I'd have to look at them to see first.
