09-14-2011, 05:57 PM
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Nutrafin Plant-Gro liquid contains trace elements with additional iron. It does not contain macro nutrients. Depending upon the minerals from other sources, particularly your tap water (calcium, magnesium, etc) and the fish stock and feeding, it might be sufficient. In my case, with very soft water, I would need to add macro nutrients as well, so their Plant-Gro NPK as well would work.
If you feel the need to use a more complete fertilizer, I would recommend Seachem's Flourish Comprehensive Supplement. It is, to my knowledge, the only complete liquid fertilizer; it contains all nutrients except oxygen, hydrogen and carbon--all three of which are available naturally in the aquarium. It works very well in natural (low-tech) systems which I assume is what you have [no CO2 diffusion, moderate light]. And long-term is is less expensive because it takes so little.
The Plant-Gro might be providing what your plants need, even if you can't see any difference. Depends upon what you are comparing "now" to. Light spectrum and intensity plus duration is also critical, plus the CO2, ammonium and such from the fish and organics.