I was thinking it was gonna be some type of sterlite container lol. I guess critter keepers could actually work really good for a low tech tank. I want to get a 7.5 gallon Mr. Aqua tank, that's rimless, but there is so much I want lol.
XD my Jar isn't an NPT, but I'm pretty sure its a sustainable system, since I've never done anywater changes in it >.> it was way too much trouble, because of the Jar height. Then I noticed that whatever I threw in there would grow like mad. Then in went shrimps who are happy. then fish >.>
Yeah I've added the sand and soil to my jar and it took up about 1/6 of it XD I will drop something I have a lot of in there tomorrow and see what happens. Are you using just natural light for your little tanks?