I have a 55 gal mixed tank with a 20 gallon custom sump. it has been up for 3 years.
Alk 8.5
cal 420- 430
mag 1350
sal 1.025
nit 0.2
phos .011
I test once a week with hanna tester, i have not done a water change in 13 months. the tank and corals look great, should i do a water change or just keep doing what i'm doing?
Alk 8.5
cal 420- 430
mag 1350
sal 1.025
nit 0.2
phos .011
I test once a week with hanna tester, i have not done a water change in 13 months. the tank and corals look great, should i do a water change or just keep doing what i'm doing?



