I have 32G tank with only 1 clown pleco. Initially he was feasting on the algea in the tank. I had cleaned the tank on the weekend. Now since there was no algea I was feeding him algea wafers. He didn't eat that for couple of days. Then I tried blanched cucumber. I boiled a slice in water for 2 min in microwave. It had shriveled a bit. I put that in the tank. He didn't eat that as well. I do see him moving about on the glass and the decor. Is he eating? Do I need to worry?