I recently started a 55g Malawi Cichlid tank. I'm not new to planted tanks or community tanks, but this is my first cichlid set up (and solely full of Mbunas at the moment).
I came up with the idea of getting a couple mason jars, filling them with Java Moss, sealing the lid back on the jars, and then punching some holes in the lid... In order to allow water to flow between the aquarium and jar, and not allow the cichlids the opportunity to destroy/eat the moss.
My concern is that the mason jar lids may end up rusting. I asked several LFS
if possible rust would harm the fish and none of them had a concrete answer aside from something along the lines of "probably not".
If anyone has any experience with mason jars/ lids in their aquarium I would love to hear your take. And if anyone has an answer as to how harmful the rust could be or if the lids will even rust I'd love to hear that too hahah. Thanks in advanced, I'm excited to hear your opinions.