I have had this tank set up for almost 2 yrs and never had this problem, but for some reason my ph dropped and i cant get it above 8.0. what should i do? one person told me that i have the wrong filter setup. its a 20gal wet/dry with bioballs and i was told that i need to be running a refugium. i hate this i here so many different stories, and i dont know what i should do. my fish and corals all seem 2 be doing fine. everythings growing and looking healthy. please help. thanks.