New grow setup

Hi, i'm new to these forums and new to growing. I plan on using a 150 watt HPS in a 2.5ftWx2.5ft deep and 3ft high area. I have a DWC setup and the only size bucket I can find are 2 gallons and they are white so I guess i'm using these with some black spray paint. I know I have to keep a close eye on pH and water level but I should be able to tend to daily. I only plan on starting 3 plants and will use the SCROG method. I hope to get 2 females growing. I'm using PBP Grow, Bloom, Liquid Karma, Hygrozyme, Bat Guano and Molasses to sweeten. I have a passive intake and a 37CFM computer fan for exhaust with a homemade carbon scrubber. I also plan on having homemade Co2 with sugar and yeast and hydroton as my medium. I plan on changing the bucket every 10 days.

I guess my question is: are there any big things i'm missing or any problems I might have here. If anyone has grown in 2 gallon buckets I would really like some input here because this is what i'm most nervous about. Thanks much, I appreciate it.

i think 2 gallons is to small for the root system i would reccomend getting a big 30 gallon rubbermaid container also i would get a like a 14 inch bar air stone in the bottom of the rubbermaid. I think the rule of thumb is 5 gallons per plant