My plants aren't doing so hot...

Only the hygrophila is showing symptoms so far--new growth is brown.
They are in an aquarium without fish at the moment, two relatively
small plants (approx 8" tall). They are still in the rock-wool packing
but will be moved to a flourite & vermiculite substrate within the next
few days.

55 gallon tank
160 watts full spectrum light
temp 80 F
Whisper filter with carbon
Tetra Flora Pride fertilizer
pH is ~7.3 (our tap water starts at 8.8!)

I don't know the kH or gH because I bought the wrong test kit :{ and it
only tests ammonia, nitrites/nitrates, pH.

I've checked at thekrib.com's nutrient deficiency chart but none of the
symptoms seem to match exactly what's happening with my plants.

Any ideas? (she asked hopefully)
Jamie

cross-posted on *.plants & *.misc