Someone has a thread on ph for organics and ya its a mixed bag some ppl do some dont.....or the thread was about ph on compost teas .....so organic anyway
I never put calmag into the medium myself.....in my experience it can cause issues i do 2 good foilar sprays in veg and one in early flower...both sides of the leaves....no calmag ever goes into my mix
The brown in the perlite is classic overwater and if its soil ph should not be a issue with rain water....im not a expert but i have grown a few plants outdoors
Still on the soil....12l of water run thru yesterday...green bucket is th MG girl....the rest were amended with MG sea compost and got a dose of great white ....so just keep your eye on the green pot for the challenge!