I have a 40 gal planted tank. Right now, i have a 1" clown pl*co in there. He eats algae, but is too small to get the heavy stuff off the glass. If I added a 3" common pl*co for a month or two, would that be allright. I've scraped this stuff off with a razor blade tons of times. Would the 3" eat the plants? I will remove him once he gets around 4" and the clown gets around 2" Erik