I have a 8 inch cube that houses only nana petites and moss.
Like what was iterated here, the small space allows very little room for error so I tent to prefer going low tech, safer that way.
IMHO nano tanks are tanks with all sides not exceeding 1 foot. So far my nanos never got any filters and such. I just plant heavily, very very heavily. i guess that is important since less plants places less buffers.
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