Make sure you continue to give grow after you start bloom nutes, plant needs the N for a few more weeks (and a small caution to not start bloom nutes too early, will affect yield by forcing flower prematurely (lots of new growers feed bloom too early to autos).
Btw I love what BB fish does, but attic space forced me to switch to grow, too strong. Had no idea it could be used through flower, will need to look that out..
You're welcome to join my current diary in my sig, I'm day 11 and haven't started with Fishmix yet. Fishmix and grow both have a great profile for veg though Fishmix is very fast release while grow is very slow release. Fish mix is much stronger too, with added sugars that can help turbo-charge microbial life in the soil on a continuous basis.
In essence Fishmix is perfect for the entire grow if you are able to maintain a super rich mycorrhizae and bacterial environment. In bloom, that should be more than enough for the plant to take from the enriched soil what it needs, without supplementation. If you're all about g/watt then sure, a targeted PK boost can do wonders, otherwise it may also fry your plants and lower final yield.
In fresh quality soil, just brew the occasional tea to hyperdrive beneficial bacterial and mycos, and you're golden with Fishmix. This is the theory I'm testing.
EDIT:
@automan2 - VERY WISE WORDS !! Never spill Fishmix .. EVER !! … btw, what size pots you use? There is a correlation
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