My fish when he bit his tail only a little tiny bit
I put him in a hospital tank last night. This morning I had to go to school at 7AM. I was in a hurry so I couldnt closely inspect him. I came back from school at around 5PM and there is no longer any white to his fins. he has butchered his tail even more and went on to his dorsal and anal fin. he has torn off approx 25-30% of his finnage I think

Whats going on? is it the stress of moving him to the hospital tank? I do plan on leaving him there for a few days (possibly weeks) to see if he gets better.
To make matters worse, the 10 gal has been having a massive diatom bloom for approx 1 week now. I JUST cleaned it off the glass yesterday and today its back. I upgraded the bulb from 15w to 27w. Hopefully that will help the plants outcompete the algae...