[Dorkel Marine 1]

A few questions about shrimp and wether they need an iodine supplement to thrive. i have soft corals, crabs and a few fish all doing very well in my set-up. I had a peppermint shrimp for about 1 month and then one day the hermit crabs were having a shrimp picnic. Before this happened in the evening he would go paleish and do circles in the tank. Around and around he went. He did this for about a week and then well the crabs enjoyed their shrimp dinner. Has anyone else had this experience, and again do you guys use iodine supplements. i do a monthly 25% water change in my 27 gal tank.

Thanks in advance

George Muller