No, cyanoacrylates were developed in an attempt to make gun sights in the 1940s. That didn't work, but worked well as a glue. It wasn't used for medical uses until some 20 years later and then not in widespread medical use until the late 90s. Medical glues are a bit different chemically than superglue, standard superglue works ok but does irritate tissues a bit.
I can't imagine you'd have an easy time getting a wild and relatively healthy bird to hold still while you sand and then smear some 5 min epoxy on it's beak.
Sure it will. Using the waste heat to heat the tank vs blowing the waste heat away and then using a heater to heat the tank.
And they're not that inefficient as heaters, all but whatever light is absorbed by photosynthesis gets turned into heat. They're just not that effective.
I don't know if I'd bother with an exhaust fan. It's not as if the air from the intake fan isn't going to be able to find a way out. And an exhaust fan will be bathed in damp air making it rust quickly. Just a grill should be fine.
I wouldn't want to pay for new, I want used and cheap. And also that site is completely useless, no prices at all. Though, I'm sure they're all more than ... let me check how much I want to pay...Ummm...About $3.50.