I used to service aquariums, but getting healthy stock for my customers became too difficult, and having had a couple of bad quarantine disasters when I couldn't get the right meds and the old ones didn't work, I quit taking on new tanks, and retired the old ones as it became time - their office changing, or I no longer had other accounts in that area. I don't miss it. I still service a 100 gallon tank, but I get along well with the customer and I was able to safely restock their Buenos Aires Tetras that were dying off, so we shall muddle on thru. The owner of that company and I are of an age, will probably both retire about the same time and he'll be due for a new tank around then, somehow I think will just close that account too.
I enjoy the smaller tanks I have at my house now, I'm learning again, the diseases all changed. And keeping corydoras on sand was something I'd never done. Although I had cories live a long time on gravel, so I'm playing with that, I don't care if my tanks are gorgeous, I spent 20 years being sure tanks looked gorgeous. I can relax and see who I can get to breed. Tries species I never did. You might have fun with German Blue Rams