So when SHOULD you start feeding in an inert medium?

Hey everyone. I've been experiementing with perlite 16oz cups for my seedlings. Doing this I realized if I didn't feed them almost immediately around 150ppm-200ppm then they would grow really slow. I use to wait two weeks before I fed them anything. Now by the end of week 1 I feed them around 275-300ppm.

Everything I read seams to disagree with my logic. If your in an inert medium don't they need SOMETHING immediately? None of my plants last very long on their on gas after that very first single blade set of leaves comes in.

Is it safe to be feeding them less then 300ppm from the get go in rockwool or coco or hydroton etc?

I have always started my plants on nutes right for the get go. But it is not necessary for the first week or so and you might burn them but ya at 150 to 200 ppm you should be fine.

i hope what you are reading is people running soil mixes not feeding initially. and then there are different levels of inert. coco is inert, but tends to grab up a bit of nutes early on, so it's best to rinse it and precharge it. but perlite probably has a lot less ionic capacity, either way basically hand watered ebb and flow is what you are running and talking about here, pure hydro rules apply with regard to feeding, which is that they need it.

Thanks guys!