Aqualady40
Aquarium Advice Addict
I have a 55g with 1.5 inch soil and 1.5 inch pool filter sand....I have been dealing with lots of tannins due to soil for a month or so and I notice I will see darkened spots on my sand as if the soil is trying to surface (idk if that is what its doing...best way to describe what I see) so I have been just placing more sand in those areas...has anyone seen this? Why is it happening? When will the tannins go away?