Glad to hear that your career situation is improved and that you're getting back on the horse! I know everyone is different, but when we had infants I felt like I had a good amount of time to be doing "dinking around the house stuff". Looking back (ours are 10 (how?), going on 8, and going on 5) those couple of years that they basically need to be carried around were great because I had all sorts of built in excuse to just kind of be lazy. I have never and will never again watch as much TV and movies as I did when we had infants. We adopted the youngest one when she was ~18 months, so kind of missed the infant stage with her, but you can do lots of things with your kids if you have a few baby carrier devices. I've walked the dogs with the youngest on my back, could easily change water doing the same (or on the front)... some of them will even sleep on you like that. Ours would never sleep alone in a crib, but would be more than happy to nap "on" us or in a carrier. I have never been much of a sleeper, so more nocturnal activities have always been my cup of tea.
Not saying you should run out and get discus, but you might find after the baby arrives that you could sneak in some additional hobby stuff. Hope all goes well with your wife, the baby, and the fish, Josh!
Please do keep us updated!