Blastos (wellesi) can be touchy. If they are established, they are quite hardy, grow well, hold their color well, etc. However, they are hit and miss acclimating from the wild. People I know who deal in a fair number of them put them in a dimly-lit "dirty" tank for a month + to acclimate them before moving them into a display tank. I have one red/yellow/green colony that has grown quite well for me, but don't have frags available. CR sometimes carries them, but regardless of where you get them, they can be quite expensive. I do have oodles of Acan lords and would recommend them over blastos for hardiness, as they are virtually bullet-proof.
Dave