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When was the last time you watered them? Also what type of lights are you using and how long are you using them for is it 24 hour or 16-8. Also 28 degrees Celsius is a little warm I like to keep my plants between 23 and 26. Do you have good airflow?

I would definitely get a temperature gauge for that room you. I keep my room anywhere between 75 and 81. I'd also get one that measures relative humidity cuz that's always good to monitor. Without proper humidity control you could get powdery mildew and other problems are associated with high...

Sorry not Advanced Nutrients. General Hydroponics three-part series micro, grow and Bloom.

I wouldn't transplant just yet I would wait for root growth to get a little more established you could adversely damage your plants or shock them and at this young age they could be deadly. Yeah with that ventilation hooked up on your HPS light your room should get a little cooler I like to keep...

The tips of plants are may be getting burnt make sure you don't get any water on the Leaf's when your water and if you do Pat them dry so that the water doesn't act as a magnifying glass to burn the leaves. PH is always important. What type of lights are you using and what is the temperature in...

That good there are many different brands of PH meters I just went on eBay and bought one. It not really a high-dollar pH meter but it works. It came with a calibration packet. the brand name is dr. Meter it cost like $15. Also if you add epson salt it will increase pH level. I add the pH Up and...

Always check the pH of your water it is extremely important for plants the only way that the plant will absorb nutrients. If the pH is too high or too low the plant will lock out all nutrients ph should always be 5.8 and 6.5 i always set 6.3. PH of 8 to 9 is way too high. Even if you just...

They should be fine judging on the size of the plant they probably have pretty decent root growth in that pot and that pot isn't an extremely big. It looks like you have a decent amount of perlite in the soil so you should have good drainage. I wouldn't worry too much marijuana plants are...

With HPS the way I have always worked it is if your hand is under the hood at the tip of the plant and your hand gets too hot then you light is to close. With a 600 watt HPS light you'll put it out a lot of light for three plants I would not worry about moving that light too far away from the...

Hi do you know the pH of the water that you are adding from the tap? pH is extremely important in plants. This is the way it absorbs any type of nutrients. If the plants have Roots then it is time to put nutrients in the dirt. Use small amounts of nutrients when they're young otherwise they...