The guy who said "First make sure the area is clear" bro I spent 5 hours waiting for the area to clear.

Just get a meg or a high level icthy and lure the mantas surrounding it to someplace more open and kill them. If you kill the first lot following the basilo, another lot won't spawn and the basilo will be perfectly alone.

Keep in mind if any creature attacks the basilo, the taming will reset.