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I like to use fine sand with goldfish, but if you think that will be too messy, fine gravel.

When setting up planted tanks in others' homes or workplaces, I usually just use plain sand to avoid any possible complications from using soil when I'm not there to fix them. For example, in a newly set up tank with too little plant mass or with fish that disturb the substrate, I find using...

I use play sand for corydoras, as it is inert (made of silica) and very fine (best for their whiskers). The "pockets of gas" thing simply isn't a real issue IMO. If you have healthy plant roots, anaerobic (no oxygen) pockets probably wont form anywhere in the substrate. Plant roots oxygenate...

Similar idea to mycorrhizal innoculation , but no fungi, just bacteria. And I don't think the selected bacteria strains in aquatic products have specific associations with plant roots per se, they are meant to create an overall healthy root environment.

Happy to hear, the corys will love the sand :). You will see them digging and playing in the sand, and being able to sift it through their gills and dig their barbels into it, so they can forage the way their instincts are telling them :thumbup: .

Bristlenose plecs and other sucker catfish don't mind (they feed off hard surfaces), however Corydoras wouldn't be ideal. As above you would need to keep a very close eye on their barbels! To enable them to feed naturally by digging in the substrate you would need some area of sand really...