bulkheads

Hello I am building a RDWC using 8 - 5 gallon buckets for plants and 40 gallon Tote for Res. I have a 8x32 for grow area. I will be installing only 4 buckets with res and adding 4 more later. wanting to see if 4 works 1st. I will be using 1" for return to res and 3/4" to feed. I have a 1200...