I have a JD in a 4' 90G with a pleco and salvini. I plan to remove the salvini. The JD was not very active and I was thinking of getting rid of him but it is beautiful fish. I added 5 red tail tinfoil barbs and I am very happy so far. THe JD is not swimming around a little bit. This is the only fish that my JD has not killed. The problem is these fish grow up to 8" or more. Will it be possible to keep this setup going? How fast will the red tail tinfoil barbs grow? What would be another type of schooling fish that can withstand a JD? I had 5 silver dollars but they were all killed.