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Love the look of your tank. I don't know why, but I always liked a dark tank. Maybe it's cause I'm an amazon nut.
I wouldn't add the GBRs, heck no.
I would get some of your fish out, that SAE should go, along with the serpaes.
That SAE can get 6inches and needs a nice big school. Serpaes are schooling fish, and if not in a school will get very very nippy. Also Mr. Sterbai needs to go or get a school.
I don't know if its just TPT, but no one here seems to note that all those fish need schools of 8
Too many species, but I can't get over your plants, they look great!

 

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No spare aquariums?
I heard people getting very large rubbermaid storage bins, putting some substrate, driftwood, heater, filter, and keeping fish in there. Not a show tank, but you can keep em there.... plus you can up their schools.
If I were you, I would sell em of on Sns, If not, build an aquarium, build filters for it, and buy a heater. Get playsand, drop in, steal some driftwood from a local creek.
It would be maybe 75-125 bucks to get em in a spare tank.
Check "uarujoey" on YT, he has some DIY stuff that could save cash.

Either way, can't wait for updates

 

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You never heard of Swap n Shop?
:hihi:
lol

Hmm...
So, your LFS won't take em... you don't have a nice, big oscar you can feed them too..., you don't have a local fish club...?