Hello,
I have a 20 gallon tank that I recently added live plants to and after
about two weeks, there is a dust like substance on everything in the
tank, except for the glass. This includes the plants, a piece of
driftwood and the heater. I am guessing that this is some sort of
algae but I am not sure. Here are some more details on my tank:

125 Bio Wheel
one 15 watt Triton bulb (I just added this second bulb a few days
ago.)
one 15 watt power glo bulb
Flourite / gravel combination substrate (mainly flourite)

Plants (3 Swords, 3 small Java Fern, 3 Lutea)
3 Serpae Tetra
3 Lemon Tetra
2 Albino Cory Cats

Water Condition:
7.0 PH
1 dh KH
20 dh GH (is this strange given the low KH? I tested twice)
0.3 mg/l nitrite
No Ammonia
77 degrees

I am using Flourish tabs in the substrate and I am adding 1/2 ml of
Flourish Comprehensive Plant Supplement twice per week.

So, after about two weeks, the plants seem to be surviving but as I
said above, this "dust" is all of a sudden everywhere in my tank. Can
anyone help me identify what this "dust" might be and how I can get
rid of it?

Thanks for your input!!
Pat