The tilapia looks like it has HITH in the 1st pic. Dat may also have an internal parasite. The indo's eye look cloudy in the second pic--- may have just been the flash -- don't know.
-- so if you get it, make sure it is in a tank BY ITSELF. Quarantine, treat, -- a minimum of one month. If you put it in your display tank, it may be the most expensive $5 purchase EVER.