The nutrient solution composition is:
N 181
P 51
K 267
Ca 123
Mg 42
S 42
using tap water (about 40 ppm of calcium) phosphoric acid as phosphorus source, and some sulfuric acid to adjust pH.

and micronutrients (Fe, Cu , Zn, B, Mo, Mn) but I´m not sure about the concentrations

This is the picture

This is the link of the picture:

http://www.flickr.com/photos/25020806@N08/4904706243/

By the way...do you know how to insert images in this forum?

Thanks in advance!

I assume your N is NO3?

Note that things other than deficiencies can cause problems. Last year I had a problem with tom survival, and after a lot of experimentation, I determined that it was a phytotoxic reaction to the insecticidal soap I was spraying.

This is the image:

I once had similarly looking plants when doing some experiments with hydrogen carbonate ion concentrations. If you can indeed provide all your 51 ppm of P as phosphoric acid and then you need to add sulfuric acid on top of that to reach a pH around 5.5-6.5 then the problem might be an excess amount of carbonate in your water.

The lack of any chlorosis suggests that there are no micro nutrient or N deficiencies but the leaf deformation and the similar appearance when compared with my experiment plus your description makes me believe that this is the problem. I would suggest you prepare your solution with RO or distilled water from now on and share your results with us once you do this.

I hope this helps !

Best Regards,

Daniel

As you can see, the tomato is returning to normal.

So, for anyone who may have the same problem: the excess of bicarbonate ion could be the problem.

Thanks again danielfp and karenkei.