Just be mindful of the heat they generate. I have a tent that size with an sf1000 and a ts1000 and at 20in 100% they both heat it up pretty good. I maintain mid-high 80s with an exhaust + 3 circfans inside. 3 3gal is a nice fit too, with 3 5gals you may have high humidity issues later. I did, but I grow in soil.