How big....?

I would honestly say, the bigger the better. Normally 20 gallons or more is better since it gives you more room and water in case parameters swing, and the more water you have the harder it is to poison them vis the nitrogen cycle dependent on if you are doing fish in (or fish out).

100% recommend that you go the biggest you can since it allows for more chance that water parameters get out of wack (takes more time to have an effect), allows for you to get more fish to add in which give the tank a better display view, let’s you grow as time goes on (moving from community fish to maybe cichlids), and let’s you get fish in almost every single zone possible.

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A larger tank is more forgiving. Honestly it is also just a lot easier to work in since you can reach everything more easily.

The bigger the better when you are a newbie.

Always bigger tank is easier for beginner to use and clean as well. It's also easy for us to understand it's ecosystem and adapt to it.

If you are starting first, you should start small. I think it is better to get a fishbowl instead of an aquarium. Once you know how to raise your fish, you can get the bigger aquarium.

Starting with a big tank is pretty okay when you have the experience to run the pond business. I believe in making big moves when such business is involved.

As far as I'm concerned, there is no benefit of choosing a small tank over a big one unless space is a big challenge for you because in the end you will definitely need to expand.

Your fishing plan is what that should decide what you would go for in my opinion. If you have plans of doing it for a long run, then it's better to start with as big a as possible but if for a short period of time, then starting small is better.

What kind of fish do you want and how many? What size is the room you're putting it in? Go big or go home? I guess that phrase could work. We have had 50, 75 and 100 gallon tanks and the 100 gallon was too huge.

Bigger tanks are easier to maintain and clean, believe it or not. I have had everything from 5 gallons to 60 gallons and the 5-gallon tank has always been the most time-consuming for me.

Most people are under the impression until they ask someone about it that starting off with a small tank would benefit them better but it's actually the opposite.

Most will recommend you get a large tank and start large but obviously only go as large as you feel you can manage.

I agree with most people here, the bigger the better. Of course it also depends on how many fish you'd like to have in your tank.