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Hello all. I was considering adding some controsoil to part of one of my tanks. The rest of the substrate is eco complete, and most likely some fluorite mixed in there. The controsoil would be going in a specific area (not replacing substrate, this would be an addition), most likely on top and around some rocks I will be adding. Will there be any issue adding that to a tank with fish in it? Or should I just stick with the eco complete?
 

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Keep an eye on parameters and treat accordingly if you see high ammo and your nitrite spikes. In and already established tank it shouldn't cause too much of a problem unless you are pushing your stock list.
 

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I don’t know if it was just the batch I got but I use a ton of Controsoil ($500 worth) and it never ever leached any ammonia from day one. Even in a brand new tank and filter. I tested for several days and eventually had to add ammonia to cycle. I thought it was strange...but plants are eating it up.
 

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I don’t know if it was just the batch I got but I use a ton of Controsoil ($500 worth) and it never ever leached any ammonia from day one. Even in a brand new tank and filter. I tested for several days and eventually had to add ammonia to cycle. I thought it was strange...but plants are eating it up.
You definitely got lucky (or unlucky?) My most recent batch of Controsoil released ammonia for nearly six months.

Because of the varied experiences, I'd certainly test some in a bucket for a day or so to see if it's going to impact water parameters.
 
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