I bought 2 Zebra Loaches and they have been in my tank for 2 weeks everything was cool and fine. My girl had to get an Upside-Down Catfish and the next day I look in and see both loaches swimming upside down under a rock and they have been for about 4 days. They will return right side up to feed but immediately flip back over. Do you thing there could be long term damage to the fishes organs or anything?