Regarding Bubble Tips, one thing you have to keep in mind is they do best in a mature, stable environment. I bought a small RBTA a year and a half ago and put it into a "broken in" Nuvo 10g. Even when I was maintaining it well, the anemone split multiple times, until I had 4 little RBTAs. I would classify this as stress splitting. Fast forward to today, after a move and some months, the 10 gallon has effectively crashed and 2 of the 4 RBTAs are gone. 2 are left, but have no tentacles. They are barely surviving. I'm setting up a new Nuvo 25 Lagoon, but I'm not sure the anemones I have left are going to make it, unfortunately.
Like others have said, a growing Bubble Tip would fill a 5 gallon, and probably even a 10 gallon. I'm going to try again with the 25 gallon and see what sort of luck I have. I'll likely be forced to move the remaining 2 RBTAs before the tank is mature/stable, but that might be their best bet at survival at this point.
Just some food for thought on personal experience. It's free, so take that for what it's worth.