I have quite a few...although I didn't have any for the first year. I think some hitchhiked in with something and I've had them ever since. I have fish, but the mysis hide out in the shadows and under things so the fish don't catch them.
On one occasion, I saw one go for a quick swim into open water. (suicidal...maybe?). Anyway, the swim lasted about 1 second.
40 Gal Hex, 10 Gal Sump, CPR overflow with Mag 7 return, Maxxima 35 RO
, 10K MH
pendant, 2 x 15W actinic, 1 yellow tail damsel, 1 high fin goby, 40lbs LR
.com rock, 1 red head goby, 1 algae blenny, Leather, blastomussa, sun, and hammer corals, green polyps, carpet anemone, 2 sexy shrimp...and more LR
critters than you could imagine in your worst nightmares.... Mantis in 5 gal