Do you have a liquid test kit handy where you could give me your water parameters?
Ammonia, nitrite, nitrates:
good job on using the prime that is locking up the nitrates so that it cant hurt your fish but is still available to be processed by your filter. I would use more prime to help lock up more nitrates since it's a safe product and you can use up to 5x the regular dosage.
I think you should do about a 10-15g wc would be good.
to give you a comparison it's usually suggest that nitrates be under 40.