Just bought two tinfoil barbs from petsmart. hope their red tail. They only had 2 the size I want. was going to use them as dithers for my JD Salvini Pleco tank which is 90G 4' long. I also have a 6' long severum tank I love. Was hoping the barbs would get the JD and Sal out swimming a bit. THey are beautiful fish(sal and JD) but never swim around. was hoping these fish would liven up the tank. What do you think of this combo. lf this tank is a peaceful set up I may move to my 6' tank and move the severums to the 90G