planted parameters

I have tried several different plants now, and none of them live. None of them. I need some help. Here are my parameters:



No3/NO2-0

pH- around 8.3

Kh-180

Gh-180



I run-

10gallon tank

2" of miracle gro capped with 1" of eco complete

78degreesF

Mechanical/biological filter

15W T8 bulb





The only thing i have kept alive is a little bit of cabomba, but it wont stay in the ground so i leave it floating. Thoughts?