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If your tent is big enough, have the fan inside to control the noise a bit.

4/1 ratio is a bit overkill. 4/3 to 4/2 at most would be ok. I believe the neg pressure is just so you dont have unwanted smells escaping out of your tent. If you have a 400+ cfm out and only a 100cfm intake your tent will have a lot of stress as its trying to implode!

A MH can only be on during the lights on period where most of the humidity problem is during lights off. I am curious though, does it need to be a MH or will HPS lower the humidity further during light hours?

Thanks alot guys, I'll check them out.

I think thats enough to scare me into buying one..... Any sugestions on brand/specs? ohhh What wattage are dehumidifiers in general? Thnx ppl

The fan controller I have ensures the fan can't turn off even when the temp drops below my target. I am about to add the 4th 600w hps next week, do you think that'll help? Mudslide9791, what dehumidifier do you have bud?

Hey ppl. I'm having some trouble with humidity going into flower. I've turned off my intake and my exhaust is on auto to maintain 24c. Lights on my humidity is around 50% but lights off it'll go upto 96%! I've got 1 16" oscillating fan to move the air around and yesterday I hung up some big...

thanks guys given me much to think about. Im gonna look more into Heisenberg's beneficial microbes thread.

Thats gonna be alot more work and seems quite complicated to me. I'll definatly look into it more but do you think they will get or have go pythium now or soon? Thanks for the quick reply.

Hi people. I've got a dwc with insufficient cooling (this will be changed). The water temperature is 21c -25c from what I remember pythium can come about when water temps get to 21c. My problem is deciding what to do.. I've got 12 babies and theyve had a rough start to life, also with the fear...

cool, the email hasnt come through yet mate but ill check it in the morning and post for ya. BTW I let the roots tangle like hell (massive root ball) never had any problems with the roots like that. While your plants are stressed or having any probs, I would be hesitant to maybe cause it any...

not much luck mate. just email them to me and ill put them up.

Sorry to hear about your girl and son mate. I personally wouldnt prune the roots. I've allways found them to go crazy aslong as you have low ppm.

I dont know about the amber bugs. Will definatly need to see the pics (how are you trying to add the pics, with a link?). <--- We should sort this 1st :) Starting from putting the clones in... 1, What temperature is the water? I keep it between 18 and 21C max. Low temp tap water will shock...

Thats it, just little changes while theyre recovering and you'll see them change in a day or 2.

No problem bud. 200 sounds good. you'll probably get alot more feeback from more experienced growers if you can get those pics (easier to see whats going on with them). Keep us update buddy.

I've got a float valve to keep mine topped up from the res too (very easy). I do like your idea tho Shafto. If I hadn't just upgraded my setup I would have gone for this under current dwc just for the fact the water can be drained and fill soo quickly but I am happy with mine. Can't wait to...

Pics would be good at this point. When you see the roots looking bigger and branching out, you can add your 1/4 nutes. I would probably add a little less than a quarter for the first few days just to be safe and give any babies that havent finished flushing a better chance of survival. Don't...

I've tried the black out around my old dwc blue tubs.... looked very bad and there was still places for the light to get in. I will be tryin out the water cooler idea in the summer as its not easy to control the water temps in my setup.

Looking good. I wouldnt worry about your PH at 6.0 it's pretty much perfect just keep an eye on it. They are about the right size for using the lights that you are. If you want them to get bigger faster then put your 600w in there, they'll definatly take off! How do the roots look and have you...