your tank is beeeautiful, I hope mine looks that nice!
point taken on the sump

but i'd even hate the idea of having the mess hidden under something! i'm sure i could make it work out neatly though. Just being so DIY-impaired i wouldn't know where to start... i guess i'll have to go back to being a newbie again!
My tank temp in my nanoreef runs at 26C constantly (sorry, I live in Australia, don't measure in F!) and the seahorse tank fluctuates between 23 and 24. On an extremely hot summers day it will go to around 26 but this is rare. So the temp isn't an issue to start off with, it just will be once I combine the tanks.
Unless, the reef tank could run at 24C? I assume this wouldn't affect corals largely and I know the fish would be fine, yeah?
It's probably the highest temp that the seahorses could go though... maybe risky?