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Well. I have 3 of them actually. One huge one that is easily 1foot round when fully open that I got from MikeP. It is still doing very well and I rarely target feed it. Its does get cylcopeeze in the water regularly though. Had it probably 4-5 months now.

The other blue tip has been growing well over about 4 months also. Had to move it around the tank a lot to find a position it would open at, and it is doing great now high in the tank.

The white one I had has slowly dwindled away, still alive but 1/4 of when I got it and it just barely extends now. It won't last more than another month or two. This one never had long feeder tentacles though so I think if you find a nice long tentacle one, they can easily do well with lots of light, minimal flow and regular food.