I have a juvenile umbee thats approx. 1.5 in long with a split in the tail that goes all the way down to the base. Will this heal. I have the fish a week now and no sign of it healing.
Yes it should. I've seen lots of tail splits over the years all of which have healed. It may just take a bit longer then normal.
EDIT: In my experience you wont see signs of healing in as short of a time span as a week. It normally takes a month or longer (if its a bad split) before it'll fully heal.
My female Doviis tail was split to the base about 5-6 months ago when she was around an inch.....now she is 4" maybe a little longer and it is still the same. I am assuming when it goes to the base it might not heal back.....I'm sure some might and some won't though. Time will tell