Had to empty out both my middle tubs to work on the back-walls and remove the separator, since my quarantine tub is occupied by a sick rescue i was one spot short. So to not further delay my construction, Renji and Rukia have become housemates.. However to prevent Rukia from eating Renji, which i consider a realistic possibility... I solved it a different way! Not that fascinating, just felt like sharing. Both of them ate immediately after moving them like this, so it works! (temperatures are great too) I put Rukia in the plastic tub because she eats anything she find in her tub, but Renji actually has to be offered food. So this way i can toss her food in, and then offer Renji his

the other way around would be better looking at their size, but this is easier for feeding and it is just temporary after all. (Hopefully not more than 2 / 3 weeks)
First i tried Rukia's baby tub, but she has surely grown out of that!! She is now nearly twice the weight of Renji who is 4 years older.
This worked however