try google search: montmorillonite clay or koi clay, bentonite clay....
a tip i have used in the past to prepare water for spawns, this method will prove helpfull for any freshwater species, i have used this in preperation many times to full effect with breeding koi discus pearl and dwarf gouramis, i also use on a weekly basis for top up water, this will ad valuable minerals not available from the tap it also has a wierd ability to give the water a crispness and sparkle like nothing else can,
the other joy is you cannot overdose and the powdered clay can be sprinkled onto fish food, i use one level teaspoon per 10 gallons as top up water, also u can preform powder into small clay balls with small amount of water and dry out then ad to aquarium for slow release as soon as it disapears ad a new ball..
i used this on my recent betta spawn i also use around 20lbs a year in my koi pond most fish in that are around 15-20yrs old..
oh by the way u can also drink the stuff lol, i do!!!!!!!

thanks banshee thats a really good bit of info!!! dont think i'll be drinkin it tho lol

There is something to be said for this brand of silt !

In our own human terms it has many pharmaceutical uses,,
From irritable bowl syndrome to constipation and a whole lot more,,
For making tablets and slow release medicines,,
Not to mention make up !

On an agricultural level I know for a fact pig and fish farms use it as it as a growth enhancer !

But I have to say I've never even considered it with the Betta !
And in truth it would help simulate a rice paddy very nicely ,,

It's a nice idea and definitely worth the experiment ,,
I can see no compounds in there that will stress or harm the Betta ,,

So I for one will give this a try at some point,,

Is it the same as green clay? I know each colour has different properties, but the other names I've never heard of. I'd never have thought of putting it in the tank either. Sounds fun!

This clay can also be used on birds to clear the body of heavy toxins