I would stop feeding or at least feed very lightly until the parameters return to normal, also.
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I may as well just put them here...
Do you know what your Ammonia, Nitrite and Nitrate levels are?
Disclaimer: Your RTC will grow to about 2 feet in your first year of owning him, and at least 2 feet more after that. Get ready, or take him back!
LOTS, too many...
I'll list my newest one - 50 gallon, 1 banded leporinus, lots of clown loaches, corkscrew plants, and 2 baby ID sharks.
As well A TON of SW tanks like my triggerfish tank.
1 mega 600 gallon pond for the ID's...