Further, are there any bottom feeders that would be o.k. In this environment? (I love exotic little Plecos, like Bristlenoses, but heard they can't stand the salt).
One-tenth salinity would be easily tolerated by Corydoras and Ancistrus, and works out at 3.5 grammes per litre. But to be honest, I'd bin the Guppies, or rather ignore salt and instead harden the water in a more effective way using Malawi Salt mixes, such as: Per 5 gallons/20 litres 1 teaspoon baking soda (sodium bicarbonate) 1 tablespoon Epsom salt (magnesium sulfate) 1 teaspoon marine salt mix (sodium chloride + trace elements) This is easy to make up using stuff from ... more.
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