Please post a picture ASAP. Also tell us all about the tank. Is this the 28 in your tank profile?
Please post all water parameters, filtration used and livestock in the tank.
How many gallons is the tank?
How long has it been up and running with fish?
Filtration both mechanical and biological?
Describe the lighting units (type bulbs, total wattage).
What are the current water parameters? Ammonia, nitrite, nitrate, pH, salinity, temp, calcium and alkalinity. Please post actual numbers for results.
What else is in the tank (livestock and equipment)?
As a precaution, do an immediate 15% water change
You do realize that the fish requires a 50 gallon tank as a minimum, right?