Is my tank trouble?

[Lonely reefer's]

Hello
75g under ATI T5 6 bulbs
22 fishes
Dosing 2parts
Nyos 160 skimmer
My No3 never goes below 20ppm(API test kit)with 10%(5g)each week
After running bio pallets for 3 weeks at 200ml
Currently my P04 0(API), N03 0(API)
Lps seemed to doing fine at the moment
I noticed one of sps frag tips is starting to color up
Reason I’m trying to decrease N03 because
sps is started to brown out after added a few weeks into the tank
Thanks you in advance

 

[theMeat]

Usually takes more than 3 weeks for bio pellets to start working. It does work, give it time

 

[Randy Holmes-Farley Verified Community Expert]

I agree, biopellets take a long time to get going, perhaps because the types of bacteria that can consume them are not nearly as common as those that consume soluble organics such as vinegar.