Does the laser work on a skyblock? Doesn't that need bedrockium under it? I'll also post my findings here also, I am new to the minecraft Mod world so I don't know the hundreds of tricks or mods to do everything but maybe it will help other people.
1. Automatic Sieve hooked up with itemducts - sieve sand which is made from earth/fire essence, one sieve with a bit of power and some speed upgrades will get you more then enough certus/charged certus and it also gives yellorium for a reactor. This option doesn't give you seeds.
2. The Deep Dark has certus quartz blocks, a silk touch upgrade through the enchanter (not the vanilla one) is another option to get the blocks to actually make the seeds.