I have had cheap broad leaved plants in my 20G for 2
years, they grow and multiply but the leaves curl up after
a week or so. (not pretty) I added some Iron fertilizer, but that only
gave me some filament algae..grr lo

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20G 15 watt flourescent, Under gravel filter
aquaclear 150 filter
2 clowns
3 black skirt tetras
9 neons
1 albino cat
1 opihi pleco