Putting the laziness and forgetting to dose aside.
I think soil helps to grow carpet plants easier.
And it provides all around nutrients. I mean you can be quite sure
that there will be all micro nutrients presented in adequate amount.
I said that because I'm convinced that my (all gravel) tank's root cause is the
lacking of boron. I mixed my traces mix following TPN recipe and
found that I had to dose 6x the EI amount (15cc per day for 20 gallon instead of 2.5)
to prevent Stargrass from shoot melting, broken blacken leaves.
Vallisneria shoots and leaves are also curled/cupped.
After increasing the B to CSM+B level (about 17.7x* the amount of TPN)
and seeing improvements, I increased the B to 2x amount of CSM+B.
Now I can dose at 5cc per day without boosting Fe, Ca, or playing with
the level of NO3, Mg, and of course, CO2.
It has been 1 week already and the situation seems to be improved.
If I can go for a month with this dosing level. Then I'm sure B is my problem.
*Based on mixing 30 grams (2 tablespoons) of CSM+B with 500 CC water.
http://www.bestaquariumregulator.com/dosing.html
Q:Why 2 tablespoons instead of 1?
A: Greg bases his EI dosing on it.
http://www.barrreport.com/showthread.php/2819-EI-light-for-those-less-techy-folks
You can prove that by his 1/16 teaspoon = 5cc.
If 1/16 teaspoon = 5cc.
Then 500cc has 1/16x100 teaspoons.
Which is 6.25 teaspoons.
6.25 teaspoons = 2.08 tablespoons.
This solution of CSM+B has B 0.0708% by weight (assuming 1cc = 1 gram).
While B in TPN is 0.004%.
0.0708÷0.004 = 17.7
This is approximate, since 1 cc of TPN = 1.04 gram.
But it's close enough for our use and estimation.