@daletta I forgot to mention before that ethylene signaling in cannabis is reliant on copper. If your plant is copper deficient it will not flower properly or won’t flower at all because cannabis uses copper ions to carry ethylene in the eyhylene signalling pathway to start flower. (which is rare but if you use only r/o and distilled water and your nutes don’t have copper as part of the micros it happens with hydro).
Do the leaves have white/burned tips and or a bluish purple undertone?
You might just need to increase your copper. To avoid anything chelated if you have pre 1982 pennies you can drop 1 penny in per 1 gallons and it will add enough copper to fight off algae and molds as well as feed your babies some copper.
I’d avoid trying to use any copper sulfate algaecide. Some people will say to use it as a copper feed but don’t. It’s harmful to cannabis and other plants and really only effective in swimming pools.
They do make copper sulfate products specifically for agriculture but I don’t recall what they are off the top of my head.