Hi Elegance--thanx for your response and good question regarding having the bubble and the LTA in the same tank. Right now the bubble sits on a rock which is only slightly elevated off of the sand. And, I only have pc lighting. I worry about placing the bubble too high because I don't have enough really large rocks to support her thus she would "droop" over the sides of the rock and possibly fall. Currently, in the 29, when she is fully open she takes up 1/2 of the 29 width wise, and also occupies the front to the back of the tank. So, if she was in with the LTA she would probably expand and eventually get close to the nem, or, if she was high in the tank she might fall off of the rockwork. However, tell me what you think of this idea: maybe I could put several larger rocks together to make a really big place for her to rest on; perhaps she could expand with no danger of falling off of the rock and into the sand. Oh, forgot to mention that the LTA also is pretty big--when fully expanded it's about 8 inches in diameter. I just thought that separating them would be safer for both of them. I figure we have enough fighting in Iraq, we don't need more with our beautiful ocean animals!