There has been some major changes since I started the plants above in my cheap DIY hydroponic setup about a month ago. Since then I have added a couple of pepper plants I saved from thinning. I must say the plants are doing better than I expected. I am still using the same homemade nutrient solution, 2 pumps of liquid plant fertilizer and half a teaspoon of Epsom Salts.
The sickly plant on the bottom left is a cloning experiment which is not going great but the plant is growing roots and apparently surviving.
Some views from below: