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Discussion Starter · #1 ·
Hello all,
One of my tanks with alder cones and IAL has turned them all a very dark brown to black color. I did a search but could not find out why. It's really odd because the alder cones and IAL have stayed the normal brown color in all my other tanks. The ph in the tank in question is at 5.0, but I have two other tanks with the same ph where they haven't changed color. Anyone know what this means?
 

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Discussion Starter · #4 ·
Means more tannins leached out.
Thx for the quick response! What would cause more tannins to leach out? It's really strange because the tank parameters are identical except for volume of water (20gal tank has black alder cones, while 4gal has normal brown ones, cones were introduced at the same time.
 

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Discussion Starter · #9 ·
Yeah I have pretty good aeration on both, spray bar and sponge filter on big tank, and hob plus sponge filter on little tank.
 
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