Like a lot of people, I got into the hobby with a small (10 gal) tank, rather than starting bigger like I should have (live & learn). But I'm anxious to upgrade. I'd like to end up with a low tech, low-ish cost, larger tank. My current 10 gal is planted with live plants but has blue gravel substrate (another rookie mistake) and the basic/built-in LED lights of the aqueon starter kit. Also a bit of a hodgepodge of a stock of fish. Oh, and my municipal water is so soft, it doesn't even register on a pH scale (which I compensate for with crushed coral in the substrate). I admittedly don't have the money or patience or desire to go hi-tech in the new setup - I want to avoid C02, etc. but wouldn't mind low barrier add-ons, like an air pump (which I don't currently have) either. I also have a HOB filter at the moment and, although I'm open to exploring other easy filter systems (sponge, etc.), I also think I want to avoid anything like an under-tank filter (it sounds complicated. But maybe it's not?). I'd also like a more.... thoughtful stock of fish. So, without further ado: What's the biggest tank, in your opinion, I can go and still meet the above criteria? Is there a good resource to find a list--preferably all in one place--of everything I need, to make the upgrade, and everything I don't know (I realize that's a weighted question)? I'm admittedly pretty nervous... Anything, in your opinion, I definitely must have? What about anything not to waste my time on? Favorite stocking options for the size? Anything I need to know transitioning both the plants and fish in the 10 gal to the bigger tank? I'd like to move everything (except the substrate) over. What am I not thinking of? Thanks so much, everyone! Look forward to making the leap!