Long story short, we got a 70-ish gal tank for free, it already had an overflow box built into it so we decided to try SW for the first time. After lots of reading and Qs for the lfs owner, we got everything set up and running, and finally put my green spotted puffer in there to help it cycle. We already had a bunch of extra fish crap laying around, so we were able to add a 20gal sump (holds about 12-15gals), and a 10gal (holds about 6-7gals) refugium without spending more money LOL. Our original plan was to pull him back out of the new SW tank when it was fully cycled and ready for other fish. The problem is, he seems to really LOVE having all the space! He has pretty much always seemed happy, but now his colors are brighter and he has alot of stuff to do in the big new tank, so i feel really bad for wanting to take him out and put him back in a smaller tank once its fully cycled. hes really cute and personable 
So i guess my Q is, are there any fish that are aggressive enough to live with him, and at the same time wont eat or kill him? I have not found much information about this. I know the pretty shrimps and snails are automatically out of the question cause he sure does love to munch on the ones i feed him. I used to have him in a lower-end brackish tank with some mollies, which he eventually ate all of them except for 3. What about corals? We are planning on building an LED system when we buy the parts. I'm sure he will try to eat soft corals, but what about the harder ones?
If it comes down to it, i could move him back into the 30gal after i upgrade the livebearer tank, not sure how long that will take though. I'm hoping to find another great deal on a tank LOL Nice ones seem to be pretty easy to come by cheaply in our area I was just hoping maybe i could build the new SW tank around him and have a few other fish or corals or whatever in there. Thanks for any info!

So i guess my Q is, are there any fish that are aggressive enough to live with him, and at the same time wont eat or kill him? I have not found much information about this. I know the pretty shrimps and snails are automatically out of the question cause he sure does love to munch on the ones i feed him. I used to have him in a lower-end brackish tank with some mollies, which he eventually ate all of them except for 3. What about corals? We are planning on building an LED system when we buy the parts. I'm sure he will try to eat soft corals, but what about the harder ones?
If it comes down to it, i could move him back into the 30gal after i upgrade the livebearer tank, not sure how long that will take though. I'm hoping to find another great deal on a tank LOL Nice ones seem to be pretty easy to come by cheaply in our area I was just hoping maybe i could build the new SW tank around him and have a few other fish or corals or whatever in there. Thanks for any info!