TheSadVeryBadMadGrower
Wait...what?
Flood trays should work perfectly..The 5's I have are shorter and wider, I have 3's that are both tall/skinny, and short/wide. And a bunch of 1's lol.
I've grown in both 5's and 3's and honestly I can't say there's been much difference in size one way or the other, but I've always vegged for the same amount of time roughly regardless of which pot they were in so take it with a grain of salt.
I've been thinking hard about trying more plants in 1 gallons next run as an experiment. I just don't want to get in a situation where I'm watering every other day. So I just gotta figure out different containers for the SIP if I go with a bunch in 1gals.