I currently have a 9 month old mixed reef tank. I have been battling high nitrates for the majority of this tanks life and I was wondering what I can do to combat it. Currently I have a solid amount of corals and around 14-16 fish ranging from small to large. below are my parameters and nitrate reading based of a API spin test would love to know what could be the issue bringing all these nitrates could it be the bio load. The sand and the rockworks were reused from a tank before this one that was a year old As well. I feed two cubes of frozen Mysis shrimps and 1-2 nori sheets every other day. water change schedule is not set 100% sometimes once every two weeks or once every month depends on time. But still once I do a water change it will drop a little and then spike right back up in a day or two would love some help on this issue. I recently added a marine Bio block and seeded it with microbacter 7 for 12 hours placed it in a low flow area but still nothing.
Parameters as of today Parameter 7/16/2024
ALK-167 PPM ALK 179
PH 7.9 PH 8.0
PHOS 0.1 PHOS 0.1
CA 469 CA 451
MG 1392 MG 1497
AMMO 0.0 AMMONIA 0.0
NITRITE 0.1 NITRITE 0.2
NITRATE 63 NITRATE 25
Parameters as of today Parameter 7/16/2024
ALK-167 PPM ALK 179
PH 7.9 PH 8.0
PHOS 0.1 PHOS 0.1
CA 469 CA 451
MG 1392 MG 1497
AMMO 0.0 AMMONIA 0.0
NITRITE 0.1 NITRITE 0.2
NITRATE 63 NITRATE 25