I got my fishy a new 3 gallon tank with some decors. I got him this real cute turtle bridge/cave thing to go in and out of and to hide in if he wants. Every time he swims by it he flares at it.. Is this normal or should I remove the decor so that it's not stressing him out. Is it because he doesn't like it? or thinks its a real turtle? or will he get use to it and ignore it? My other fishy isn't bothered by it.. He likes to swim through it. I don't want to stress the little guy out.. any advise please.. thnx