2 weeks old lr/ak47 their edges of the leaves started to dry in paches and the they started to get yellow and twisted,they are drying more every day now the growth seems to stop.this started after 3-4 days under cfls 23wx5 every plant had one and the tem 24c humidity 40-50%.now they are under a 430 hps same conditions 65cm from the light i gave em distilled water then now i give tapwater that sits for a day or 2.i have this ph meter but i dont know how to use it it has a screw on the back side and a little screwdriver in the instructons it says to submerge it in a solution to adjust the ph but i dont have the solution and in this country of mine i have nowhere to buy it im gona order it but i dont have 2 weeks to wait for it, is there a substitution for it can i submerge it in distilled water and set it on 7.0 ph is that corect woild that work

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