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I nticed the other day my Royal Pleco was on it's back under my stone archway. I feared the worst but as I approached it with the net it got up and swam away. It seemed to swim fine after that. Today every time I look at the tank he is on his back, but then gets up and swims away when approached. I have had him for two years and this is not normal behavior. It is a 120 gallon with live plants, rocks, and driftwood. His tank mates are 25 neons, 12 Von Rio Tetras, 6 otto's 3 clown loaches, 5 glass catfish, 1 brazilian stripped pleco, 11 guppies and 1 blue gourami. ph 7.4 ammonia 0 nitrite 0 nitrate 10. There are no visible signs of damage of any kind. All the other fish appear happy and healthy. Any thoughts on what it could be?