On the nutes topic, and I think you have a leak somewhere too lol, I am small time at the moment running 20 gal tanks. Not knowing if this was gonna be for me I wanted to go cheap and ended up with a good product in my limited experience. If you go on ebay the shop urban hydroponics out of Cincinnati Ohio sells small bags of their
nutrient. I spoke to the guy and he uses masterblend calcium and Epsom salts in the lettuce one I use. He also has others made with masterblend as a base.
I don't know the guy other than buying his product but for lettuce it seems to work.
I am going to try the tomato blend this fall.