Just had over 6 1/2 inches of rain in 48 hours due to Ike. When out to check the nutrient tank water level on my hydro buckets system. As you can see the water is right up to the return pipe
and leaking out the pipe excess hole. This is one concern you should take into account when making your tank. Is the water level should ever rise above the return pipe. The water level in the hydro buckets could rise and damage the plants roots. Of course, this all depends on the over flow level you built into the buckets. All Im really trying to say here, is that you should build a over flow into your nutrient tank. So that the water level won't sub merged the return pipe.