IMO is “in my opinion.” Sorry.
Ignore the shop's suggestion and change 75% of the water daily.so i did a 75% water change on Saturday, and i was able to get my water tested today. the ammonia was really high, and they recommended another water change but smaller, closer to 30%. Shady seems happy, and doesn't look like he has fin rot, but i'm still wondering about the little black specks on his tail, and what i can do to keep the ammonia down