@Ashbash, I've got negative pressure since ive turned my intake off (too cold now) and haven't had a issue just keep a vent or two open. I meant the clip on fans I've just got them and there not too powerful. My last standing fan was bit of a beast, soon as I took it out my plants went healthy. Just checking wasn't same issue.
Lemon juice is how I lowered my ph before I was feeding. Soon as added nutes my ph would luckily be 6.5 and atm on full feed it's 6.2.
Genuinely put it down to the biobizzheaven because I've had 3 crap grows without it having to use loads of lemon juice. But I fully understand on funds. And as to run off if you do have salts built up there just going straight back into the plant when you let it sit in it
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