ok so i set up my new 300 gallon aqurium 2 hours ago. i added the coral and sea salt to water and my hang over flter. i have 7 inches of gravel. i added my bala sharks and they were swiming at the top bout now theyre on the bottom acting all werid!! 
they are sharks from the ocean the pet store calls them bala. or something and they look like real sharks. HELP
they are sharks from the ocean the pet store calls them bala. or something and they look like real sharks. HELP