Hi, I recently filled my 120 gallon tank with black smooth rocks that I found at the ocean. They are all the same kind and they are not porous. They have been in the tank for over a week now and the fish (cichlids, catfish, and gouramis) have not shown any signs that they are being affected by the rocks. I was wondering, though, is there any way that they may leach salt into the water? I wouldn't think so because I soaked the rocks and scrubbed them all very well, but I thought I would confirm. I don't have any instruments to measure salinity and I'd rather not go out any buy one for no reason
Also, for future refference, if I am using the wrong kind of rock ( I couldn't tell you what I am using now, I'm not geologist
) what kind of natural rock can be used safely?
Also, for future refference, if I am using the wrong kind of rock ( I couldn't tell you what I am using now, I'm not geologist
) what kind of natural rock can be used safely?