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I am growing in a 20 gallon tank with two air stones and pumps, I have a metal halide 250w lamp for 4 plants of which the tallest is about 24 inches. I have kept the light on the entire time, and am about to switch to 12/12. The roots are dangling out of the bottom of the pots submerged into...

I am growing in a 20 gallon tank with two air stones and pumps, I have a metal halide 250w lamp for 4 plants of which the tallest is about 24 inches. I have kept the light on the entire time, and am about to switch to 12/12. The roots are dangling out of the bottom of the pots submerged into...

im a moron... any suggestions as to what to use on top?

what should i use to cover the open areas of the tank so that light cant get through? Aluminum foil?

my girlfriend and I are growing hydroponically for the first time and we have 4 plants in a 20 gallon aquarium tank. Each plant is in a pot with small holes cut in the bottom so that the air stones will flow air into the plants. We are using perlite as the fertilizer in the pots. Today I noticed...