oh gawd...... so it's not just one fish - you're working on killing TWO fish?
Flushing the poor fish down the American Standard whirlpool of freshwater death would be more humane....... REALLY
Just stop. Stop. Stop. Stop. Stop. Stop. Stop.
Get the fish out and go buy at least 10 or 15 lbs of live rock from a REPUTABLE store. You live in PA - so there's more than 1 saltwater store around. You got a friend or 2 with a car. Go shovel some snow for cash and buy some live rock.
Cycle the live rock in the tank for about 8 weeks. WITHOUT any fish. Remember, you got rid of the poor fish because you were just killing them.........
That will give you time to bag some groceries or flip some burgers and buy a test kit. API is fine if you're on a budget. You need to test pH, AMMONIA, NITRITE and NITRATE. Cycle it 6 weeks before you bother testing anything.
When they are ALL at ZERO go get a fish. ONE fish. One SMALL fish. Not a giant fish and 14 corals and 468 snails and a starfish and oh look how cute the sea cucumber is.....
ONE SMALL FISH. PERIOD!
Do water changes every week with GOOD water.
Flip some more burgers and bag some more groceries. Buy a REVERSE OSMOSIS water filter. Don't buy anything else until you got a test kit for ph, ammonia, nitrite and nitrate AND an RO water purification unit.
Take 2 aspirin and call me in the morning..........