So my tank has been running for 6 months now and I’m noticing a lot of coralline algae growing and I have been really bad and haven’t tested the water in forever so far I’ve only my tested my phosphate and nitrate and my phosphate was 0.16 and nitrate was 0.25 to 0.50. And I have no filtration I only put a filter pad in once in a while to clear up the water a little, I have a couple corals and they all seem happy. So should I just let it be and do my normal weekly water changes or should I add chemi pure to help with the leaves? And which chemi pure the nano or the 5.5 ounce (my tank is a 20 gallon waterbox so basically only 18 gallons). Thanks in advance!!