03-22-2013, 09:41 AM
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Would try twice a week with the Flourish comprehensive and give the tank a few week's to note any improvement.
Would limit the duration that light's are on to no less than eight hour's ,and no more than ten hour's with the single T8 bulb. (which would be considered low light)
Would check to see if your water hardness is comprised of mostly calcium,or magnesium,or both(=)good.
If water is like some,mine included,,it is mostly calcium that I remedied by adding 1/4 tsp of Epsom salt per week in 55 gal .
Magnesium is very important to plant's, and although hardness test reveal's GH,it makes no distinction between calcium or magnesium.(water could be void of one or the other)
In any event,,such small amount of epsom salt will have no negative effect added along with twice weekly Flourish comprehensive.
Flourish has a liitle of everything and with your lighting,,the extra dose each week might very well be enough nutrient delivery for improvement.