RTBA question

[mark]

Guess got lucky with mine. Picked up 1 RBTA and 3 GBTA around 3 months ago. The GBTAs have all stayed within a couples of inches of where first placed and seems the shuffling was only after one split. The RBTA let go the first night and landed beside one of the GBTA and hasn't moved since.

Seems like shouldn't need to, but was spot feeding mysis but now give each about 1/2 pencil eraser sized piece of shrimp every few days.