I just got 4 baby piranha about 2-3 days ago. They are in a 10 gallon tank right now. I went to sleep last night n they were fine. When I woke up this morning I could only find 3 of them and couldn't find the 4th. Turns out he was stuck to the filter. After getting him off he was not swimming well and looked a little beat up. Almost as if the others may have taken bites out of his back n bottem fins. What should I do? Should I put him in a Gladware container to seperate him til he heals? He is having trouble swimming at first. Now he is just chilling at the bottem of the tank hiding in the rocks (which is what they have all been liking to do) They are very small. About the size of a dime and slightly smaller. They wont even eat the guppy that's in there yet. Please help! Thanks Sorry I do not have any water test kits right now. All the water that is in the tank is right from the fish store though. We brought about 10 gallons home from the tank they were already in.