ORA Captive Breed Seahorse

Hi. I was going to get a 5g dwarf seahorse tank. The problem was I could care for them but when I went away no one I know would be able to keep them. So I'm not getting an dwarf seahorse tank, but an ORA Captive Breed Seahorse tank. I am getting a 13.6" x 13.8" x 24.8" (24.8" high) Aqueon 15 Column tank. Can I drill this tank on my own with a "paddle bit" or a "hole saw". I was thinking about connecting this tank to my 40b (55 gallons of water) and this tank would also be my display refugium. Or would this tank be better of on its own. Also, I will be using a full spectrum T5 lighting. And does anyone have any recommendations for macro algae the seahorses would like, I was looking into mangroves.

Ps: PLEASE, PLEASE, PLEASE don't tell me this tank is too small for captive breed seahorses.