As noted, scooter blennies are much like mandarins, and do best in large mature reef tanks no younger than 6 months old. My absolute minimum for selling one was a 55g with at least 55 lbs of LR, preferably set up at least a year.
These sorts of fish can eat up pods very very quickly, and not all will take to things like frozen brine (which should be fortified, if it is fed). Many do starve to death, over many months.