I am forced to switch these girls over to flowering within the next 4 days, due to time restraints in the future and I have been having pH problems and root rot. I solved the root rot and algae with some hydrogen peroxide and covering my res to prevent light problems but just found out that I shouldn't have hydrogen peroxide in me res. It has been in there for about 2 weeks.
Currently:
pH-6.3
14 gallon tote with 5 gallons h2o
2 tsp Fox Trot per gallon(last added nutes a week or 5 days ago (when I cleaned my res)
temp of water is around 72f
temp of Closet is 73f
Circulate feed 10-20 minutes a day+spray with nute water to get rest of roots
I have fans going into closet
CFL grow
There is a lot of damage that was from my pH being out of wack(too high then too low) on my lower leaves, but now that I fixed(so I thought) my pH problem, my plants are looking a lot healthier, but they are still slowly yellowing and browning higher up the plant and on new leaves.
Help!!! Suggestions?
First, I think it's great that you are checking the pH & temps. I don't think low 70's will bring root rot solely, there's more to it than that.
I don't think that you have to concern yourself with old leaf growth but if your new leaf growth is brown, things aren't going well.
I got a lot of advice from people on here and they were great. Don't let people fool you into thinking that they have a masters degree in pot horticulture... This is just gardening man/woman... That's it.
It's not that hard.
I see you have a 14 gallon tank with 5 gallons in it for a decent number of plants. You should up it to a good 7 gallons and don't worry about keeping the top roots & rockwool cube saturated at all times. I go in there once a day and hit them with a turkey baster from the res and they're fat.
I don't use a pH or PPM or flux capacitor reading, and they're fat.
The H2O2 that's been in there along with other junk for 2 WEEKS ? GET IT THE F___K OUT OF THERE.
Clean the res, start with fresh water & nutes and go from there. If you're in doubt, there's an 8 step recovery process that's been posted a million times. It's a fancy way of saying: "Start from scratch".
I do this every 7 days and if you check out my pics, though I haven't posted any in over a week, they are thick & bushy.
Keeping the res clean with fresh nutrients is the key. Now, it does get a bit more expensive, but on my end I re-use the nutes outside on the lush vegetation that the previous owner of my home left for me. But really, at the end of the cycle, spending another $50-$100 for top nutes is truly worth it. Think about what that $50-$100 will buy on the street... Just about nothing.
So, flush those old nutes, fallen/broken root pieces, old H20@ and sediment OUT of that tub and start over. Just thinking about what the tub must look like is making me ill. (Just trying to stress a point, not hurt your feelings).
Are you using a bubbler/air stone setup ? If so, I don't think the 'mixing of the nutes' is necessary. Do you use a cauldron ? LOL... Just kidding.
All the time, money and more time people spend on keeping that initial res nute solution optimal is beyond me.
When in doubt, flush & change.
Cheers & I hope this helped without offending anyone. And if it did... so be it.