Put him in! I have a blue lobster in my 75, with among others a JD. I also have a tangerine in the tetra 55 tank. AND a regular cray in the 55 AC
tank. Big Blu and the cray just molted on the same day a few days ago.
The A cichlids are very rarely nosy and the cray lets them know it and thats it. He is 5 inches now and possibly any smaller tank might be different results. But in this tank I have dozens of cubbies, holes, tubes etc. As well as 100lbs of rocks.
Big Blu doesn't bother anyone. Even the cats bump into him and he doesn't care, just goes about his business.
Same with the tangerine. Funny, he has a tree house and when I give snacks, my panda garra and him share like they were brothers!
The only tank that has none, is my 29, because its heavy planted and alot on the expensive side. It's also where my panda garra fry are and no way I'll take the risk.