Hi :)
So here's my review of Growth Technologies Liquid Oxygen!
I use this product DAILY - it is H2O2 Hydrogen peroxide and I add it to my tank at a level of 50ml per day, 100ml on tank changes. My res is overfilled and around 200l
It is very cheap and combats Pythium as well as other moulds in the root area. It is £25 for 5l which lasts ages as well. Prevention IMHO is better than cure!
Things to consider:
Cost
It is a mild acid and can irritate
Plus side:
Pythium prevention
mould prevention
Added oxygen in the water
I cannot praise this product enough - it means even with my chiller, if there are issues with high temps, I know I am covered