"Epsom salt (MgSO4-7H2O) has a 9.9 percent magnesium content.
Magnesium chloride (MgCl2-6H20) has about a 28% magnesium content (if I recall). So use about one third the amount...
Or if you need to buffer up your pH anyways...you can…"
Welcome to the group. That's an open question, there are a few easy system designs that we build. There is the media-based units, Nutrient film Tecneque (NFT), DWC Deep water culture also known as the raft…"
"Nope, I did not encounter any such problems (even when I was using the rockwool barrier between the two layers with mineral supplements). In the hot pepper pots I did not use rockwool and did not use any mineral salts."
"If you are not taking solids out of the system by using a media bed for filtration then you need far less feed input, so fewer fish. You can cut the feed by about 80% and still have plenty for the plants. Remove some solids and have more fish.
"I tried spraying a potassium bi carb solution on my cucumber leaves but it seemed to burn them. My plant is otherwise healthy and even flowering so I removed the two leaves most affected. To what pH should I mix the spray to?