I just added my largest kelloggi to the tank on saturday....She's maybe 5 - 5 1/2 " now.....She was stressed the first day , not ever seeing a sand bed , rocks, fish and a powerhead....But after 12-18 hours or so came around and is eating like a champ....I did have to move the large orange female mollie though....She eats ALOT and was always around my horse, eating her food so she went into my hex tank, but all in all the transition went smoothly..My other 2 mollies are very mellow and eat at the opposite side of the tank....and yes , they eat frozen mysis
....my royal gramma is a baby and never even glanced at my horse...the next largest horse will be going into the tank in a week or so