At the moment the only cleaning crew I have in there is 2 sea cucumbers. I have a bird wrasse in the tank that eats most of the inverts that I've put in the tank. If I don't remove the dead fish will it toxify the tank?

I also saw someone stating that they test for calcium and alk.? Is it necessary for me to test for this? I've only ever tested for amm. Ph, sg, nitrites and nitrates.

Any pointers would be appreciated!