I understand 0 is not good hanna checker only reads to .00 100th and the ocean is in the 1000th .005 so 0 is good we are trying to duplicate the ocean right . My water looks like my fish are floating in air . I do not have a nitrate checker that is any good but my coral looks good and fish are fine. Clean my spunge and spray off my screen on my ats once a week . Thats it 4 month latter 0 phosphates 0 nitrates well test shows yellow . I feed 1 emerald cube and one cube brine and latter one pinch flake. .5 sheet nory everyother day. I do not know if that is good or not for 1. 4 inch yellow tang 1 5.5 inch one spot foxface 1 1.25 inch neon goby 7 blue green chromis 2 inch and under 2 clarkii clowns 2 inchs 1 hovans wrasse 3.5 inches . Display lights on for 8 hours algea turf on for 16 hours . Think I will sit back and see how this turns out. Just put in 2 montiporas today will see how they do. If it wasn't lights out I would post pics . They will have to wait. 125 gallon with 120 pounds rock . Koralia wave pair alternate on front bottom right and back bottom right about 2100 gph with one running a jap. Wave maker middle left hand side pointing up on pulse have a 1 inch wave on top of water back and forth. Two corner overflows down to a 30 gallon sump clear pro aquatics 2 inch and a half pipes connect high in the back with slots that spill over a 12 x14 pinky filter pad and 5 gallons of blue bio balls under that through the large spunge into the protein skimmer ,reactor, and return pump. Well, took out bio balls removed tray and filter pad and 1.5 inch pipes and cut my own pipes with the slit long ways put two screens in them dropped in two 100 watt equivalent 3000k led bulbs and off to the races.left the spunge only mechanical I have. I change 5 gallons every weekend and another 5 for evaporation .I know that's only 20 gallons a month water change but I do not have many corals yet as long as my calcium and alk stay were they are now I will worry about it when it changes.8