Hi Tat,
I got the 2 tiger tail cucumbers from the same LFS. I would say they are useless for the sandbed cleaning job. They move slowly and not always like to eat. They like to hide under the rock and I never saw them for 2 months.
Good luck!
My AquaC Urchin Pro is powered by Eheim 1250 and already running more than a month. It produced little foam and watery, light brown skimmate. Is it because of the too little bio-load? I have only 5 1" damsels and 50lb LR. I heard someone has powered Remora Pro with 700gph or 900gph pump and...