around 6/21 his tail split about 1/4 of the way i kept an eye on it and it didn't turn to fin rot but didn't heal either. i was gone over the 4th of july weekend and when i got back on the 6th there was a sizeable chunk missing from his tail so on the 7th i moved him to a 1 gal critter keeper so i could do more/easier water changes to promote healing. the second day in the critter keeper the ends of his tail where (bitten/ripped) had turned slightly black, i did a water change and it was gone by the next day and hasn't returned. his fins have not gotten worse but they haven't healed back together yet either. so how long does it take? he seems happy, hes eating (better than before) swimming around, flaring and bubblenesting. the last couple of weeks in his 45gal alls he did was glass surf at the back of his take and he hasn't done that at all in the critter keeper. i think it bothered him that he couldn't see me unless i was on the floor, where he is now he can see me no matter where i am in the room. but i was never able to figure out if he bit his tail or ripped it on a broken hammock (i didn't know it had broke) but when i was cleaning/draining the big tank i never found any bits of fins.