Crassula rupestris x perforata) 'Baby Necklace'
http://www.paghat.com/babyneck...
Hmmm, wondering if we should go to a forum where we can find other Texans to help with this project. Everything I come up with works for me, but may not work for you in your growing conditions.
Here is the Texas Forum. Post a new thread over there and see if some one can help you choose a nice draping plant for the fish. Just remember to tell them it will be in full sun.
http://garden.org/forums/view/...
Can't wait to see what they come up with.
The watering thing will come to you with time and experience. You don't want to keep the soil wet/moist. Just water and don't water again until the soil dries out in the top inch or two.