Hello. Just wondering if anyone else has had this experience. I have a 75 gallon tank with 2 common plecos. The 2 get along just fine, since the tank is plenty big and they have grown up together for the past 3 years. Anyway, the bigger of the two has taken to banging on the tank lid. He used to only do this when I was late in feeding, but now does it all day and all night, doesn't seem to be any rhyme or reason. Anyone else have a common pleco do this? He launches himself up like a dolphin. It was funny at first, but now it is getting annoying and I am more afraid he's going to cause damage to the tank. Thanks for any and all replies.