What to do?

Watch la fish guys on YouTube he helped or just watched his buddy do it on his 500 gallon tank. I look to see if I can find the episode for ya.

 

My thought likely comes close to the addition type suggestion but it's only a thought so hey, ignore it if you don't like it right ?
I am biased but really love my refugium. They are easy to add on, come in every imaginable size, and if you pursue it you can do some really cool things with macro algae.
It offers benefits to your existing tank in a myriad of ways but for your purposes is just a cool new addition which wouldn't require doing anything radical.
You could likely finance it by trimming/selling/trading some of your grown out corals or pick up the hard goods on the cheap.
I obviously have no idea what your space/configuration options are but that in itself would be a fun research project.
Anyway, just an option to consider.......

 

Don't fiddle with the big tank if it's working great for you. So... Get a small tank that you can have fun with, try new things, etc.

 

Let's see a pic so we know what your dealing with

 

I would say try going nano without a ton of equipment. Sps in a nano tank are quite a challenge and interesting. You have to trim them every week, but you can direct the growth and patterns with the trimming and even gluing the trimmings on the coral, make a super thick base on a stag for example.

 

How about a species oriented tank like seahorse/pipefish?

 

Sounds like perfect time for an upgrade. Big *** tank time.

 

Any interest in breeding?

Otherwise a really cool refugium would be cool.