Reddit mentions of Inkbird IHC-230 Plug-n-Play Humidifier Dehumidifier Heater Mat Greenhouse Humidity and Temperature Controller, 110V, 1200W for Terrarium Brewing Reptile Amphibian Incubator

Ok, northern lights. Day 14.
Started in rapid rooters then Planted in tupur by Gold Coast. Basically coco and perlite mixed.
Canna coco nutes currently at 1/3 recommended. Watered today after waiting 4 days.
All temps/ph is in the photo. I've ordered this and I'm just waiting on its delivery to get the temps higher and humidity in the right range via regulating the exhaust and a humidifier. So that should be fixed as soon as I get it.

Here's my problem, I watered 4 days ago with simple ph'd water(I'm only using nutes every other watering) Afterwards the two lowest true leaves started curling down. The tips touch the soil.
So I slowed down and waited 4 days, the top inch of soil (knuckle deep) was dry 12 hours later but the leaves still showed signs of overwatering so I waited 4 days. Today they were still curled but not as severely. The soil was bone dry 3" down (it's so dry the inside of my cabinet is littered with soil from the fan blowing it around)

Today I watered at 1/3 normal nute strength and the bottom leaves (only the first true leaves) are again curled down so far the tips touch the soil(you can see the tips in the picture on the left and right underside). Again indicating overwatering right?

So what do I do? Water even less? Wait 5-6-7 days?
I'm not soaking all the soil. Like I said it's super dry the next day. Just enough to soak a 5" ring around the plant and maybe get 1 cup of runoff. Which just like the water going in is at around 6.0ph.

Sorry for the long post, just trying to share all the pertinent info. This is my first grow in 6 years and I'm clearly rusty and not very confident.
Suggestions, ideas, insults, any guidance will do folks. Thanks.

You are on the right track and sound a lot like I did about a year ago, lol.

Food - don't stress too much about organics. For quite a while the only thing I fed my guys was some nut/fruit trail mix, egg shell crushed and Dried red Shrimp. Only recently have i started to venture out into other types of food. /u/Spizam71 is really into the food and has helped me a bunch. Keep in mind these guys are bottom feeders and are like 1-2 steps from turning organics to dirt, if that makes sense.

Environment - I too had trouble here. I'm in Michigan and I first got my crabs on vacation in Alabama in Feb. I tried all sorts of things. What finally worked for me is getting a piece of Plexiglass for the lid and sealing it near completely. I too have heavy coco fiber mix. This wasn't perfect and actually led to my tank's back panel cracking - it wasn't exactly cut to size and at the time i had no means to make minor adjustments - i forced the lid in. Its holding together and has for about a year now, but i bring it up so you don't make the same mistake. I'd just suggest getting a glass lid for your tank. the tank I'm in the process of putting together now is a 75gal (48x18x22), I bought manufactured glass lids. you want the tank sealed. i now tape around the edges of the tank because the plexi has grown some bowing. As for the heater, I would suggest one that goes across the entire back above the substrate. This will heat your air and hopefully pull water from the substrate to give you a stable 80%RH. With where I live i had to build a DIY fogger that's on a Controller. having the controller is honestly the only thing that worked for me. My heater is on the same controller.

Here are the products i have used or still use.

UTH - Bean Farm (taped to the back with aluminum duct tape) You say you have a 20gal tall. if that's the tank then your dimensions are:

• AQUEON or Marinland - 24x12x16
  
• Maineland ExtraHigh - 20x10x24
  And i suggest this https://beanfarm.com/collections/heating/products/ultratherm-heat-pads-6-x-23-in?variant=24905302345
  
  Controller - https://www.amazon.com/gp/product/B01I6BZ2IO (I'm sure there are others out there, but this is what i have been using.) Hoping my next tank doesn't need it with the way I'm setting it up. Small tanks are VERY hard to regulate and maintain. The bigger the tank the easier this gets.
  
  Lids - If you are Marineland - https://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3730+3731+3781&pcatid=3781
  If you are AQUEON - https://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3730+3731+3790&pcatid=3790
  Tip: research the model # of the product you are going to buy and make sure the dimensions fit. Marineland and Aqueon have different opening dimensions that eh lids need to fit into. I got my tank off of craigslist so i was guessing based on dimensions what brand i had.
  
  Lighting - Dont worry about UVB. Its not essential. These are nocturnal creatures and the only light they require is daylight ambient light and darkness at night (the darker the better) If you want to view them at night, use red or light purple or blue(psuedo mimic moonlight) and only have the light on while observing - turning off when you are not. light 24 hours a day wont kill them overnight, bu could impact their day/night cycle which is an important aspect to their overall health. I personally use LED (try not to have full spectrum as this can lead to algae and other unwanted organics growing in your tank.) My latest tank I built a DIY 4ft RGB LED using the following resource https://www.youtube.com/watch?v=_EYC3obFY4w
  
  Optional**Fogging - For my small enclosure I built a DIY fogger using an Ultrasonic fountain fogger off ebay (they are cheap) here is an Imgur album on it. Super simple to make. Try and limit "misting" with a spray bottle. You do not want any flooding or collecting water at the bottom of your tank. https://imgur.com/a/unEgH
  
  last, my little 15gal. I had 5 but now down to 3. One was unknown reasons, the other was recent and i think due to a surface molt that I treated wrong and never dealt with before. Wrote a post on it here. https://www.reddit.com/r/hermitcrabs/comments/87akfa/a_heads_up_and_possible_suggestion_that_may_save/
  
  Tank - https://imgur.com/a/52gcP ; https://imgur.com/a/hqmNh ; Our Priority; he's #1 https://imgur.com/a/XHcw1
  
  I hope this helps!

Hey using the exact same setup as you for a veg tent at the moment albeit I used 200W 6500k CFLs for bushier growth during first 10 days. I have a 240 CFM 6 inch inline fan I am using without any fan speed controller, I have all 3 flaps open for passive intake and my plants are thriving:

Proof: http://imgur.com/a/fMR5X

Trained 4 of them last night and here's a pic of one: http://i.imgur.com/gWDOjJL.jpg

I am using

https://www.amazon.com/Inkbird-Plug-n-Play-Humidifier-Dehumidifier-Temperature/dp/B01I6BZ2IO/ref=sr_1_1?s=industrial&ie=UTF8&qid=1481767548&sr=1-1&keywords=temperature+and+humidity+controller

and after you calibrate it to the AccuRite Humidity/Temp Monitor it'll work perfectly.

I plug in for temp when lights on (outlet 1) and humidity with lights off (outlet 2) for my exhaust fan. But unfortunately, since the tent is in a closet, it tends to get humid so fans are always on during lights on or off.

> The humidity controller is an Inkbird

By the way, Inkbird does a combo controler that controls both temperature and humidity with the same sensor

It's so expensive. Why don't you consider inkbird IHC-230 humidity and temperature controller?. One plug is for humidifier and the other is for heater or fan. Very cheap for one, below $50.