I had a pair of silvertips for about 8 months, then randomly one of them dies, now the one thats left, seems healthy, but depressed if thats possible for a fish...he swims around the tank like he used to w/ his partner, but now he stops every 5 minutes and just hovers in the corner for about 20-30 minutes, eats fine, my question is, should i get him another partner...i'm questioning in regards to 1. tank size, 30 gal, will eventually be a 90gal possibly bigger, and 2. the silvertips my LFS gets are usually only about 1 1/2 to 2" long, will he still make "friends" w/ the oldy thats already in my tank? Or is it not worth getting another one at this point? When i had the pair they always used to swim together, always. Let me know what you all think. Thanks