hey /an/to any of the fish hobbyists in here...these are from an old smaller fishtank that was hardly used.Are these white things carbon? If so can i reuse them?
>>173800They're porcelaine. Yes you can reuse them.
OP here .. thanks anon :)
OP here again...what exactly do they do? sry google wont answer my question
They are a filter substrate.Nitrite bacteria can settle on them and then do their thing.I don't really like em, I prefer to put these sponge filters in my filter.
>>173804just an extremely huge surface for essential bacterias to grow on.
Whats your tank setup?