I thought i was ready to purchase some discus for my 125 gallon tank but now i am really confused. I am reading that they need an advanced level of care. On live aquaria, i have the right temp in the tank at 78, ph of 7.0, but as of kh i never heard of that so can somebody clue me in... I have in the tank now, 1 male angel, rams, corys, platies, and tetras, so i am sure they will be compatible. If anybody has discus experience could you fill me in on what kind of care they will need compared to my other fish...Thanks