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As they get bigger, you might want to think about have a large amount of nutrient in your resevior because it'll start sucking up fluids like crazy and you don't want it to get to low before you can replenish the used amount of water. When I had my first NFT, I had some days it was using 8 or more gallons in 24 hours
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Yes, I will need to do that as they get bigger. My broccoli plants are reaching full size and they are taking up 1-2 gallons almost daily now. It's not even warm weather wise, so it cant be evaporating. I originally thought that the drain holes were clogging, that did happen once to one of them. I just took the hose off and poked a small screwdriver around in it and it came pouring out. But as the water seemed to be disappearing I kept checking all the drain holes but with no problems I came to the conclusion that the plants were drinking it up. I have add 2 extra gallons of nutrient to it (8 gallons total now) and add at least one gallon of fresh water a day.