noticing this yesterday on my clown she is in a 5 gallon pico for now. started getting a white spot it’s been running for 6 months with her starting in the tank. tested my parameters everything is stable. Never checked ammonia could this be the cause? I do weekly water changes 50% weekly with dosing Kh everyday For stability. Also I dose microbacter 7 a bunch weekly in this tank having a little algae issue . I have 4 tanks this one is really testing my patience. Any help would be appreciated thanks.