nitrogen nitrogen nitrogen......they look hungry...

they are very light in colour, and i wonder what your lighting is as well....

nice temps..i find 78 is ideal, and you are right in there...

i would suggest, in my opinion, a ppm pen......i find they work very well along with the ph tester kits...

good luck, and let us know what happens after you give them some nutes, and if there are any other problems...

princess