Wanted: cup of coarse substrate

argan · #1 10-01-2018, 04:51 PM

If you are in a bind, you might try crushed oyster shell from a feed store. It may add a bit of nitrites and phosphate but your biological filtration should be able to take care of that. Is it for a calcium reactor with a c02 bubbler?

argan · #2 10-01-2018, 04:52 PM

It should be under $20 for a 20 lb bag or whatnot

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