I use Hanna ulr po4 test and Hanna HR test.
Currently no export at all. Since my mag calc and alk are in a good range, I don’t see the need to do a water change. Haven’t done a water change in almost 2 months.
Filtration, 55 seachem tidal with filter floss and carbon. No skimmer either.
Stock: 25 gallon water box clear with 2 false clowns, bi colour blenny and a clown goby. I feed twice daily