Read this link on anaerobic substrates, which I think is what you have. A lack of plant growth in the affected areas (roots) causes this.
ADA Aquasoil is well... you could say it's better than Lapis sand, because it has nutrients in it, as well as somehow allow plants to root faster and thus grow better. However rescaping is a big pain in the *** with Aquasoil (minute dust particles get kicked up), and it renders the pH/kH scale for measuring CO2 levels useless.
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