What is the one thing to check?
Let's say you have set up a marine aquarium and have cycled it etc. However, Everytime you introduce some hardy fishes, they all die very quickly within a day. What is the first thing to check?
I understand there are a number of parameters to look at. Is there one gadget that one can buy to measure all the important parameters instead of individual test kits?
Thanks for your advice.
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