well I wouldnt say its MORE O2 necessarily.but its more of an even distribution of the Air and even drying. they are larger stones or they really small?I have only used them a few times.Im not immensely familiar with them but I have seen and heard of issues here n there.Thats all.Use them broseph.Not trying to dissuade you from not using them,just passing on some tips is all.Happy sprouting buddy!
but all pots its about even feeding,even distributions of materials and moisture,life and easy root movement.Just make sure they are not under the sproutling when popping your seed. other than that enjoy the Tabs man.I like them. you across the pond bud? might wanna look at KIS organic or Build a Soil Coots mix or similar from them for future grows.Stellar mixes.The tabs are excellent too just can require a little bit more work.I grow with thee least effort.half the time I literally water only.I dont do nadda typically cuz i am a lazy old grower.LOL and KIS and biotabs work exceedingly well together BTW

enjoy buddy!