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This is where it is easy to kill Disas.  Only the most dilute solutions should be used.  If the TDS of the fertilizer solution is above about 300 ppm, there surely will be some problems with the plants.  I only fertilize during spring and early summer.  After the flower spike is close to maturity, I discontinue feeding until the next spring.  Different people have different ideas about when you should fertilize.  Most agree that you shouldn't fertilize during  winter.  I've testing the idea that Disas don't really need fertilizer to grow.  One of my smaller flow trays contained water that was not supplemented in any way.  It didn't work very well.  I've gone back to supplementing all the plants with a very weak fertilizer solution during their growth period.  Try and keep the total TDS to between 150 and 250 ppm.