I can't recommend anything, as I am not a veterinarian. You need to do your own research. Fortunately, the web makes this rather easy. Try searching for "aquarium antibiotics" and refine your search terms as necessary.
Don't. It's not right is it? And, morals aside, if it became widespread knowledge, it could tarnish both your own and your company's brand. Are you funded? What would your VCs think? Focus on your business and your friendships, nothing more.
Yes, for the reasons you suggest. It's not about pure speed - you are very fast without the proper technique. It will take you a week or two, blending the exercises in with whatever else you have going on.
Actually, what made me stop using Borland (C++ Builder) was switching to Linux (going to open source GCC and wxWidgets library) and web (Browsers and PHP getting good enough to build bigger projects in it).
Borland failed to deliver usable solutions for Linux and web at the time and after I got used to new tools I simply did not bother to try anymore.
I'm wondering as well! Been a UK-based API-level tech author for 10 years and in product marketing (and sales, even) before that. I've programmed as a hobby for 25 years, and love technology so much I'd like to spend the next 10 doing it professionally. It doesn't even have to be a great job :-) But age goes against me, despite an enduring passion in tech and having learned several languages on my own dime.
Similar story here. South Wales steel town -> Oxford (Engineering Science). Late 1970s. I'm certainly wealthier than my parents and home town peers (you can still - easily - buy a reasonable 4 bedroom house there for 100K) but the baggage is still a burden. To misquote a popular aphorism: You can take a man out of the poverty, but you can never take the poverty out of a man.
Color me flabbergasted. Props to these guys for launching an MVP and all that, but seriously - what a value proposition: "Why order online when you can get someone else to do that for you adding an undisclosed middleman fee?". First world problems.