 What's ok to add
Hey guys- I'm feeling a little confused about what sort of nutrients one can expect to add to a NPT. My tank doesn't appear to be growing- some of the plants are looking tired, a little yellow and generally unenthusiastic (namely the swords and java fern).
Recently I redid the tank because I suspected stagnation of the substrate. Upon tearing it up, I was right- the fine substrate between the soil and gravel I had used created a cement-like barrier between the two. I removed it, added more of each to balance out the depth and still no improvement.
My CO2 is still practically non-detectable. How do I improve this? For a 40 gal. tank I only have 14 fish- is this not enough? Should I be dosing it with trace nutrients? The KH and GH are both acceptable (I don't have the numbers in front of me, though).
For lighting I'm running 2 x 55w for about 4 hrs w/ a 3 hr siesta, followed by another 7 hrs on. Fish are happy, snails are doing alright, floaters gallore...
What's missing? | 
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