Hi
Assulin! ...your girls are looking damn good bother! ....I forget what brought you to the LHT a while back,... So, I think Trap' and Brim have made solid calls on this,...Although, pics taken if regular lighting will be much better for diagnosis-- HPS really messes with greens and browns, which are critical colors for diagnostics,... Mid level leaves you say? ... yeah, sure smacks of both Ca and Mg defc.,... right symptoms, right area on the plant, right timing too! K is also a possible defc. but it can have similar initial appearance to Ca defc. spotting/blotching,....I've looked up Biobizz nutes, and they are very mild, so I'm not surprised you have a little defc. issue starting,... damn, how does a grow shop have no Ca-Mg? I highly recommend ordering it mate, nothing beats a dedicated supplement for this,... Meantime, I'd soil dose with the epsoms (MgSO4 only in this, no Ca) at 1tsp/qt, or a fat tsp/L, then wait a couple days to retreat,.. it'll take that much time at least to get up in there,... I don't think there will be much reversal of symptoms for Mg defc., none for the Ca,... halting progress is what we're looking for here! If you weren't in bloom, I have you try foliar spraying, but not at this point (potential mold issues).... Now for the Ca,...dolomite is way too slow, so that's not so good for treating defc.,... can you find some unsulphurated molasses (treacle)? This can do in a pinch, hold you over until some proper Ca-Mg supp's can be ordered,... ****.... LOL!- you will be lectured sternly about pH my friend!! And fairly so,... one can get away with not checking sometimes, but it'll bite your ass at some point, and often as not, it'll be the root cause of many defc./lockout problems,... deficiency can be caused by just plain not enough of a certain nutrient, or it can be caused by too high of acidity/alkalinity in your medium, which makes them become unavailable for absorption, even if there's plenty there! Honestly, a pH meter is just half of what you need... a soil pH probe is also very handy... I dislike the run-off pH testing method because I feel there are too many possible sources of error in the process,... the meter is perfect for testing solutions and pure water, but there's nothing like getting a pH reading directly in the soil! ...Only soil probe I recommend is Accurate 8,... same principle as the cheapie skinny $14 ones you see at garden centers, etc., but those are piss-poor in accuracy... My A-8 has been a grow saver! ....here we are, spending all your $$ for you-- :roflcry:... let us know what you can scare up bro', and we'll go from there... feel free to post up at the LHT--it's always faster,... :thumbs:
