Hey it is any deficiency with fresh growths or its...

Raise your PH, lower PH levels in DWC cause these problems

Hello When you have that yellow/bright green new growth it can sometimes be down to an iron deficiency. It will typically come in bright and then turn green as it grows out, but it's also fairly common to see this on a young veg plant. So with the calmag supplement and the Canna additions it's most likely just running it's normal course. Just keep the ph in the right zone and the mild nutrients and you should see it grow out of this with time.

This is a Chlorella Alga — a single-celled green Alga , it does not represent harm, it just does not look neat , it appears from moisture , and most importantly from light without light, it does not live! I don't think the problem is caused by algae! I think this is the wrong NPK or too high ppm!

There is something going on but the picture needs to be closer to identify exactly what deficiency it is, when I checked your diary I did see a picture that showed there is some algae build up around the bottom of the stem. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.