40 Gallon Breeder Stock List Check

Good morning fellow reefers!

I am curious as to whether or not I am fully stocked or if there is room for another fish or two. Possibly a small puffer.

I have a 40 gallon breeder with overflow, 10 gallon sump/refugium setup which was FOWLR intended which has since turned into a "mixed" tank.

Current fish stock list includes:
1x fuzzy dwarf lionfish (trained him to eat reef frenzy)
2x mated clown fish (1x black ice, 1x phantom)
2x mated or sibling green chromis (school together)
1x mexican cerith snail (in sump)
4x margarita snail (in sump)
4x peppermint shrimp (in display)

Current coral stock list includes:
1x acid splash GBTA
2 colony pulsing xenia
1x rogue zoa polyp

End Goal is to have a pulsing xenia tank with as many GBTA as she wants to split into.

Equipment:
OceanRevive ARCTIC-T247 Lights
Bubble-magus G3.5 Skimmer
10 Gallon Multi-chamber Sump/Refugium
40 Gallon Bare Bottom Breeder
40-50 lbs Live Rock
RIO+110 Return Pump (I think 300gph - runs wide open)
2x Sun JPV 530 GPH Powerheads (1 in display, 1 in refugium)

Water Quality:
Salinity 33
°F 78
pH 8.0
Ammonia 0
Nitrite 0
Nitrate 5ppm
Days Running 57