Hey Matt, welcome to TR.
My post may come across as a rant but, it is meant to set you and other potential newbees on a course to success. It's a known industry fact that out of the thousands of people that get into the hobby every year,
90 % get out in six months to one year. Why? Because they fail. Why? Several reasons, they are not committed, they think they can do without some basic equipment, too expensive, you name it.
Before we can REALLY help you with your current problem, and any future problems that might occur, we need to know some basic information about your tank, water and inhabitants. You've given us a few things but we need more. One of the problems beginners run into is not knowing what equipment to spend their money on, the importance to put on each piece of equipment and in what order to buy them. You buy the tank, stand, hood, filter, heater, light, salt, etc, haul it home and set it up. Beginners inevitably forget about or ignore some basic requirements like education (books), water parameters (test kits) and other equipment necessary to "keep" a saltwater aquarium in balance. I've never met a beginner that understood the
true cost of keeping a saltwater is not spending money on good and necessary equipment but on
replacing dead animals that never had a chance to live a normal like cycle because of an inadequate set up. They, the animals, and the new hobbyist never stood a chance of success because the hobbyist was not committed to doing what is right. This is an easy hobby to have success with
IF you follow the already established rules of success. One of those rules is to have a good set of test kits.
You can't rely on having your water tested at the
LFS, although many people do it. But, it's usually those people that can't answer our questions when we need
current basic water parameters. When we ask, "What are your water parameters?", we need to know what they are right now. Not last week or tomorrow from the
LFS. If you don't know them, we're asking you to test them right now with your set of test kits because,
that's the only way you can give us ACCURATE test results. When you remove water from your tank and transport it to the
LFS it changes. Also, your
LFS's test kits may be old, the employee may read or test it wrong giving you a false reading. It just isn't accurate enough to be considered reliable in my humble opinion and experience (60 years in the hobby). Every hobbyist needs to step up and take personal responsibility for every aspect of the hobby. It's the only way to get the results I know you are seeking.
Specifically, what are your readings for the following....
Ph =
Ammonia =
Nitrite =
Nitrate =
Salinity =
Temp =
There are other readings, such as,
Calcium
Alkilinity
Magnesium
These are important too, but, not to answer your current question.
We need these measurements to be current and accurate before we can truly answer your questions. Otherwise, our answer may be as inaccurate as your readings. It's all based on accurate information. The computer age ushered in a new phrase that applies here as well, "Garbage in, garbage out".
I really hope some of my rant makes sense to you.
Dick
icon under their name to add to their reputation. 
