20g long. No smaller please. Lol
Starting a 3g cuz its the thing to do rn but ive also had a 10g before in my bedroom back at moms and it wasnt set up very long till i went to the 20L.
The 20L was a very succesful tank.
If I started over....the same size I have now 29 gallon in a wall with similar sump. I could go smaller in that space with a 20 gallon which would give more side room for pump placements. The 29 is a tight fit now.
It would be SPS dominant since I haven't focused on that realm.
The smallest I’d do is probably 2 gallons. I’ve had tanks from 5 gallons to 200 over the years, and right now I only have a 28 gallon Nanocube. I would still probably have a larger tank if I didn’t have health issues and could keep up with the maintenance. I think if I get my health sorted out, I’ll probably set up a larger tank (I would like maybe a 180-220g cube). I’m currently thinking about setting up a 10-20g frag tank, but I’m not 100% on the idea yet.
Smallest? 20 gallon. I have a IM 20 drop off that has a pair of black storm clown fish and two Chicago sunburst anemones in it. It's one of my favorite tanks and I have a 210, 85 and 55 gallon in the house.