I've got a melatremus, a white ribbon and a snowflake. The only one that actively cruises the tank is the white ribbon. The others only come out during feeding. The snowflake is especially active when food hits the water.
I wouldn't mind finding one of those chestnut or viper morays; those just look sweet.
Anyway, all the morays get mysis whenever I feel like going upstairs to the freezer - which works out to three or four times a week. Occasionally, they get krill, but it's such a hassle to break up and thaw
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