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You say that they are over 5 weeks old did you start from seed or are you talking about clones?
You want to cut your clones from a mother that has not yet entered the flowering stage. Once it has established roots a Clone is at the same exact...
Once roots have been established give them some water nutrients and exposed them to light either natural or artificial. As long as they receive...
There may be some nutrient lock up as well, check the ph and give it a good flush
CO2 is not a cheap commodity. Your plant will take the biggest benefit from co2 application if you use it during the light cycle through the...
If you give your plants less than 12 hours of darkness per day during the flowering stage the plant will return to the vegetative stage
Root rot also known as Pythium or damping-off is a common waterborne disease that can seriously affect indoor and outdoor plants. Rockwool is a...
The length is not the important factor here, a cutting for cloning should be not less than 25% of the thickness of the branch that it is being cut...
Clones or Seedlings?
It sounds like things are working well for you I would not move my seedlings under the big lights until they have developed at least four or five...
I found this web site with some interesting info on fluorescent tubes http://retirees.uwaterloo.ca/~jerry/orchids/tubes.html
Advanced Nutrients has an extremely comprehensive website that includes a nutrient calculator try this link...