I'd say you're ok. I have two in my 77 and they're both doing fine. One has been in there since 6 months after I started up the tank. I wouldn't recommend what I did necessarily but this guy is now a good size and bulked up nicely. My set up was previously owned and the LR, although initially not as much as I have now, was established. I have observed this guy taking granules of CycloPeeze from the sand, so he is supplementing live with dried food. The second I added in hopes of having a pair, but made an error and ended up with another small male. After discovering my mistake I went back to LFS and asked if I could trade him in. LFS was ok with that, but I'm unable to catch the guy. So far the two are not getting into any major confrontations. Newb gets out of Dodge pretty quick when big boy gets close. The big guy doesn't go out of his way to hunt down the newb. Anyhow, getting a little off topic with my story here, but just wanted to relate my experience with two in a 77 and both finding sufficient nourishment. With a 165 like yours I'd venture to say it's almost a no brainer. If one can't survive in there, there's something amiss.
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