Quote Originally Posted by MdmPele
Looks to me like it needs more N, and the soil looks way to heavy, holding in too much moisture.
Soil does look heavy, and is likely holding moisture too long...but exactly what is it you see in his pictures that tells you he needs more nitrogen, even though the plants are dark green, and in mid-flower? I'm sure your heart is in the right place, but risking someones else's grow with inaccurate advise is not cool in any conceivable way.

Unless properly buffered and lightened-up, (ammended) compost and worm castings are really too heavy to use for indoors. Makes a muddy mess that will suffocate roots, and can screw with flowering. (stretches plant, prolong's flowering) Likely the existing source of nitrogen (compost and castings) are doing their organic job, and slowly releasing their elements as they break-down. You can't add perlite once plant is in the pot. (unless you can carefully tuck the perlite under/around/inbetween the roots) It get's mixed-in to the soil before use.

Can you wait till soil dries, and slip the rootball out, to check on root growth?
Anyway, likely I'd find a commercial potting soil and transplant as soon as possible. :thumbsup: