Saltwater care

In a fish only tank.Your biggest concern is going to with ammonia,nitrites,nitrates,temp,and PH.
So about the only "chemicals" you'll have to worry about is buffer(if your PH drops).But regular water changes should pretty much keep everything in line.
 
I agree with Yote,the only chemical really needed is a pH buffer.Of course,you should have test kit for what Yote mentioned.
 
You shouldn't have to add anything for a fish only tank, except a pH buffer, as stated by Reeffreak and Yote. And even then, you shouldn't have to use one regularly.
 
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