Alk is definately something you want to be testing for.... It needs to be in balance with calcium, and often new tanks have ALk problems...Also if the brain was at all receded when you got it there is probably no hope for it...Generally this is a sign of bad health. additionally I have heard of green algae blooms in tanks causing problems with less than healthy brains. Keep it in low flow, get a test kit for alk and feed it once a week with meaty foods.