Important Lesson for noobs.... (like myself) - Learn about your fish before you buy. Actually, I knew that truth (I kept a tank a number of years ago) but I honestly forgot something about Corys. My son had given me an established tank and while picking up some mollies to add to it I picked up an Albino Cory. For a week now he has been running wild, back and forth, all around, hyper! (stressed) I thought the poor thing was going to burst! Then in another post I mentioned I had a cory and two kind forum members let me know that one Cory will not be happy. This morning I added 5 more. The reaction of my original Cory (who is the smallest) was priceless. Instantly he "played dead" (I thought it was gone!) Then, within 30 minutes it was lazily laying and meandering around with the others. One big happy family. I am amazed that a fish's behavior could change so COMPLETELY in 30 minutes to an hour. Unbelievable! I want to thank "BornThisWayBettas" and "junebug" for letting me know about my error. For those new to the hobby - Please learn about the requirements your stock will need before you buy. Don't make the same mistake I did.