[APD] old soil substrate

["josh bjork" <fishytaste at hotmail_com>]

I've got a soil substrate based tank that is a year or a year and a half 
old.  It's 50gal and I used maybe a coffee can full of soil under poultry 
grit.  It had a very nice growth spurt when the roots hit the soil.   The 
growth has curbed significantly.  I have a medium fish load and give it 
potassium occassionally.

My smaller 20 gallon soil tank with 1 algae eater looks fabulous with no 
care at all.  The tank has been running with no circulation for 6 months or 
so.  What causes this fizz?  I would think the tank with fish would have 
much more growth than one with an unfed algea eater.

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