Hydrogen peroxide

[Sk3lly]

Yep you can still continue to use it. I am using DIY co2 and glut at these levels. This might help for diagnosing plant deficiencies. Aquatic plant deficiency - Aquarium-fertilizer.com

Great link Flit, thank you very much for your help. Thanks to Old Scales too

 

[Old Scales]

You're very welcome. Note that Glut is what Excel consists of. A cheaper bulk form of Excel is Metricide 14 from Amazon.com. Goes for $17-$21 a gallon. Mixed 50:50 with distilled water and you have two full gallons of "Excel". MUCH cheaper. OS.

 

[flitabout]

That's what I use. I don't cut it I just use it in half doses.

 

[Sk3lly]

I will use my remaining excel then look into glut next time