Okay, so my 20 gallon tank now has 5 tetras, a bala shark and a pleco. Last night we went out for a couple of hours and when we got home we checked the fish to see how they were doing. In our tank we also have 4 fake plants and a castle. Our Serpae somehow managed to get himself stuck between the castle and the glass. He's never done that before and he looked so scared. We were able to set him loose but it took him the rest of the night to swim correctly. It looked like one of his fins fell asleep, like when your foot falls asleep. The cool part is that I caught the Black Skirt tetra helping the Serpae keep afloot. It was cute and endearing.