there shouldnt be a harder time with peppers or tomatoes its just about doing it right. there are a few ways u can do this flood and drain, drip line, aeroponicly, they all have there +/-. you can use gutters that are capped, a rubbermaid tub or just another tank it really is going to depend on how big you want this and what method are u doing to use to grow. the hardest thing imo is designing how u want it to effectively use the light source. go to your local hydro store and just talk to them they normally will help u even if ur just looking for ideas.