Thanks Weedhound, I did start with some bad stuff second hand that I thought would do the trick and using the sodium based products I got from pool chemicals and sulfuric based epsom salt alone did not help me much in the beginning. Those just made my water too high. I don't have much to go by but I try to learn from the dumb stuff. Now I use proper AN PhDown and Fox Farms ferts which have the magnesium sulfates already present.

I like to change my res. once a week. 3 gallons circulating for two plants. That will eventually need improving too. Step by step this time around until I get it right.