Got some pics?

If it is nute burn then yes it's likely one of the "Time release" (the little opaque beads that look like plastic) balls popped right on a root. Which is part of the reason that MG is not recommended, since it's basically impossible to control nutes.

That's a huge space for a seedling, so the lack of a fresh air source isn't a problem yet,... but it will be later in the grow. Get that fixed ASAP.


Get an aquarium PH droper test kit,.... they're like $5 USD and will save your ass from PH lockouts. Then get PH UP or PH DOWN (which ever way you need to go) and get your PH to 6.0-6.5 for your inbound water.

If your PH is incorrect the plant won't be able to uptake nutes propperly causing all kinds of problems including the plant straight shitting the bed on you.

Get this lack of PH monitoring fixed IMMEDIATELY!

Good luck brother! :weedpoke: