| If the paint will be under water, it will eventually flake off. Especially on acrylic. Not much in the way of paint will stick to it. Most kinds of enamels, and even automobile urathanes will blister and flake underwater. When we used to paint the bottoms of vintage woody boats for show purposes, we'd use very high quility urathane paints, over fiberglass, and we'd tell the customer not to let the boat sit in the water for more than 3-4days, or the paint will blister.
Is it a 6' aquarium tank? Best bet might be to get 3M vinyl that's used for sign making, comes in a rainbow of colors. I would think that it would stick good.............. Just wait a couple days for the moisture to dry out behind the film, and allow the adhesive to bond to the surface. You need to apply it with a couple drops of cheap-o lemon dish soap to a pretty full bottle of water in a spray bottle, and squeegee the air bubbles out. Let dry and wash it out to get any soap residue out.
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