Thanks headshake. i hope it's just water spots, as it's possible i dripped a bit from my fingers after they were in the res tank...and yes, the rockwool was soaked in ph'd water...i know what you mean about the temps, but sadly there's not much i can do about it other than spend money i don't have on an air conditioner which will further increase my carbon footprint! will maybe just do grows in cooler weather next time...
thanks again for your thoughts,
best
jash