Looking for something clay based I think that can be mixed with gravel, lasts forever and ok with loaches.
Looking at seachem fluorite (red) or maybe eco-complete?
I think I'll add about 10 kilos so gets too expensive for API laterite gravel (couple of kilos in tank somewhere).
Tank is co2 injected, dry ferts dosing, etc.
![cb8d7c31aa2a97c7fc36cfaf79ba19dc.jpg](http://images.tapatalk-cdn.com/15/10/11/cb8d7c31aa2a97c7fc36cfaf79ba19dc.jpg)
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