I have some dirt capped with coal slag, but everything I read on the coal slag said it was pretty much inert. I can't think of much else that would release It high Fe into the water column. I'm thinking of just trying some maracryn, but my shrimp (got some dark red beauties) are already berried. I didn't want to do anything to upset them. I don't have another free tank to put then in either. I'm going to take out the corner sponge filter and treat with antibiotics. After some water changes and carbon, I'll stick the shoes back in for a filter.
I'm hoping to find the balance of keeping the nutrients put of the water to keep this from happening again. I don't dose yet, and my tap water isn't too high in nutrients. (As an aside I lived in German farm country for 7 years where the water was perfect. You could literally take it straight from tap to tank. A little high in copper from pipes, but that was it)
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