@cshouston I have a similar approach to @Ippyroy I start my frags low in the tank on a magnetic rack, and raise them up over time. I then take them off a frag off the rack when I get to the height in the tank where I want to mount them. So I get a chance to see how they react / respond. Of course, water flow is way different between the rack and where I want to mount them.I used a rack and moved them up slowly. Then I just set them in place. If they fall I glue them down. After a few weeks I will use putty and make them permanent. They snap off easily with glue.