hey i have a 30 gallon tank with no hood and have a t5 coralife lamp on top. i was think of gettin a thin 1/16 or 1/4 inch thick piece of plexiglass and cut it to size just so i dont have a open top and stop the salt marks from around my tank top. this a good idea?
I prefer having open tops for a healthier tank. You can go the plexiglass route if you want to go for a closed top. If you're growing corals you're going to need to clean the plexiglass to keep from salt accumulating and reducing light penetration into your tank.