How long have you used the Oceanic and what did you use before?
I would highly suggest testing a freshly made batch of your SW
after mixing and aerating for a good day. Please post alk
, pH and Mg
as all will be needed to make an informed response. If you do not have one of these types, get your LFS
to do it for you. There are also several places online these kits can be aquired at relatively small exspense. Keep in mind each one will last close to a year if not longer.
It is a necessary exspense, especially if keeping invertebrates.
Oceanic has been linked to several algae blooms, more commonly cyano
and diatoms so there is a good chance it is your root cause. You also made mention awhile back that you use only flake foods for feeding. While there's nothing truely wrong with it's use, it can be an overwhelming source of organic PO4
which will fuel cyano
unending. Many types of freeze dried and flake foods are augmented with a vitamin C substitute (L-Ascorbyl-2-polyphosphate
) that is loaded with organic PO4
as is store bought fresh and frozen seafoods (tri-polyphosphate
). Although you haven't mentioned the size or type of the "sea shell" you aquired, it is possible for it to contribute to the problem albeit very small. As it dissolves, it will release any elements it deposited in it's growth, including PO4
If after a large 25% water change there has been no drop in your Ca
levels, this tells me there is one of three problems. The salt is designed to have that level of Ca
, the alk
is extremely low and/or the Mg
levels are too low allowing Ca
to climb independantly. None of which can be solved without knowing the results of the above tests.
As far as your question regarding the anemone, high Ca
will not directly impact the anemones health but there is no way of knowing how it will impact the ecosystem thereby indirectly affecting the anemone as well as the rest of your animals. You need to get the chemistry issue solved before
you consider any new animal additions.