I keep the ph up with crushed coral added to gravel its about 8, witch is a little high but I've found that low Ph is a real killer. I do 70% water changes every 5 to 7 days , fresh water is the most important thing Imo, Its a 150 with two big pwer heads, Eheim pro 3, I do salt and stress coat with water changes. But I may try this prime that I see in the threads. Also considering small 30% water changes in between the full scale ones. But it has worked out fine. ALSO BEFORE SUMMER IS OUT GONNA GET ANOTHER 180 OR 150 AND SPLIT THEM UP cause I know it is over stocked.Croweding them like africans and site breakers is what curbs the aggression. Just a few fish that I want are odo and nic. dovii. I have everything else that I really like.