I have a 55 gallon with three mbuna cichlids. this morning bfore i went to work, i checked the ph and noticed it was low. i added the tablet ph raiser(the one s that dissolve like asprin). when i came home from work 9 hours later, i noticed the water was extremely cloudy and my fish were looking a little sluggish. any suggestions/reasons why this is occuring would be greatly appreciated.