Ok, so about a month ago i bought to small agelfish they are about the size of..a quarter now and they are very healthy and active..but today one just dropped dead! about 20 minutes before this i walked by the tank and the one that is now dead kinda freaked out abit.. his mouth is gapped open like..maybe he chocked on something or..couldnt get enough air? about 3 days ago i added a air stone so they would have more air..i duno what happend..
please help
