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I've an NFT setup consisting of 3 tanks. 2 of them are fine. However 1 of these has a whitish colour liquid floating on the solution in the tank. This is similar to the way oil floats on water (because it is less dense). I've no idea what it is from. The plants look healthy and the other 2 tanks...

I'm using an NFT setup. What is the best way to get rid of a buildup of salt? I've emptied the tank and put in fresh solution. Should I pour the solution over the rockwool cubes too?

I'm using an NFT setup. It is a tank which contains the solution and and tray above it in which my plants set in rockwool are in. I'm using a water pump which is constantly on. This pumps water from the tank into the tray. The solution drips off the end of the tray back into the tank. I was...

Can the underside of leaves absorb light?