I have the Finnex 4gal and 8gal, and love them. Haven't had them long enough to tell you just what plants will grow well, but I stuffed them full of fast-growing stems and the wisteria is growing right out of the water. So far, low and medium growers are doing fine. One disadvantage--with open tops, there is a lot of evaporation. I do water changes once a week, and still have to top off in the middle of the week, but it is not a big deal. I also have the Eclipse 5gal hex as a betta tank, and love it as well. It comes with a 10w 5100k pc bulb--replaced it with a Wal-Mart 15w 6700k sunlight spiral pc, and crypts, anubias, baby tears did extremely well. I just rescaped it and am trying various plants to see how they do. The one tank I would not recommend, unless you want to spend a fair amount of money to retrofit the lighting, is the Eclipse 12--standard lighting with it is a 13w pc and that is dim!