If you plan on flood and drain the best thing to use is a 3inch block either coco or rockwool
I start my seeds/clones in a root riot or peat pellet once I see roots I transfer to a 3 inch block.
I then keep the blocks under a cfl till they have a good root system (when they need watering once a day) or you can transfer as soon as you see roots out the block.
Dont put them in the system till you have roots out the block.
I would go with either a 60/40 coco clay mix or 100% clay pebbles rather than just coco.
More floods mean bigger buds
Its a great system I would recommend anyone going down the hydro route to get one.
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