I have a really old huge sea shell that was pulled out of the water during the 30's and is still crusted with coraline algae i know it's okay to put dead corals into aquariums but is it okay to put a shell or will it cause PH probs?
Yes it will raise the PH, and yes that is good - as long as you do not put it in a tank which already has a healthy PH of 8.0-8.4, then you run the risk of the PH going too high depending on the inhabitants needs and tolerability...Is that a word or did I just invent another one??