Only thing I will add is 2 things.
1. I have plants. My bass love to sit behind them when they feel like it. Seems to calm them down. I have live plants but I think fake are ok. Many many bass keepers don't believe in plants because they take up space. And maybe it's because my bass are young but that's what I do.
2. Don't go out and buy a fish now. Heck you only have a 75gal! But I think some other fish may help. Pbass do look at what other fish do. Especially other bass. I just think another fish, especially a bass helps them start eating pellets and stuff. If it happens that this guy doesn't make it, you may want to consider this if you buy more bass. Just make sure you have a big tank!