Dark brown spots on Rockwool

I am pretty new to hydroponics I have only tried this once before with great results. This time around I have noticed Dark brown spots on my Rockwool As well as green algae. Is this normal? I added hydrogen peroxide at 3 mL per gallon to my reservoir tonight seeings how I am going to do a rez change this weekend. Plants are five days into flower And looking good. Just worried that this may cause a problem in the future. Any help would be greatly appreciated. I have included photos of the infected area of one of the plants but they all pretty much have it

I guess I should let you know a little bit about the set up lol. I am growing in a 4 x 8 tent Temperature stays between 73 to 76° Humidity mid to high 60’s. I am using Botanicare nutes In a 30 gallon rez. Water temp Stays around 70 to 76° ppm is 900 ph 5.6. There is very little to no fluctuation in runoff pH and ppm is steadily dropping around 10 to 15 points per day which I assume is a good thing lol. I top off my Rez every other day with fresh water and nutrients solution change and scrub my reservoir once a week.

Are you using salts or organic and what are you doing for sterility?

I’m using the entire botanicare line of nutes. I pull my reservoir pumps and Air stones once a week. I scrub my reservoir with soap and bleach water rinse it out thoroughly and run A light bleach solution through my pumps every other week. Tonight I added hydrogen peroxide to my reservoir I’m gonna run that through for 24 hours. Then scrub and clean my reservoir. I was also considering pulling all the plants this weekend scrubbing the tray and lightly washing off any algae from the root system on the bottom. I’m just really worried about the brown spots I’m seeing in the Rockwool

Not normal. What I don't get is that you appear to be using an organic line of nutes. In addition to the living organisms provided by your nutes, you are also now growing green algae and some unknown additional brown goo.

Adding peroxide will just indiscriminately kill everything, both the good shit and the bad shit. Won't you then just end up with a clean rez but also a somewhat starving plant? I don't think you can't have it both ways.

My suggestion would be to switch to non-organic nutrients, like Dynabloom. Simple.

No mixing of parts, no combining this or that, no dissolving of any powders, no bullshit.

You just measure, pour, and stir. Done.

You might also want to wrap those blocks in foil to block all light. Kill that algae with darkness.

That's just my $.02. Best of luck to you. Cool plants.

MrFlatbush said:

Not normal. What I don't get is that you appear to be using an organic line of nutes. In addition to the living organisms provided by your nutes, you are also now growing green algae and some unknown additional brown goo.

Adding peroxide will just indiscriminately kill everything, both the good shit and the bad shit. Won't you then just end up with a clean rez but also a somewhat starving plant? I don't think you can't have it both ways.

My suggestion would be to switch to non-organic nutrients, like Dynabloom. Simple.

No mixing of parts, no combining this or that, no dissolving of any powders, no bullshit.

You just measure, pour, and stir. Done.

You might also want to wrap those blocks in foil to block all light. Kill that algae with darkness.

That's just my $.02. Best of luck to you. Cool plants.

Click to expand...

This is what I was getting at.

Live hydro is incredibly difficult and unwise

Do you filter the grow room with merv filters? Clean air takes out any possibility of your air pump contaminating your res. I use a merv 9 and 13 on the intake side of tent. Have no data to support this claim. Just what I do. Feel the more control the better. Good luck.