Anyone know what this little black spot might be on my black clownfish's right fin? Its showed up over night, but im confident that it isnt Ick because there are no white spots anywhere on her. Any knowledge would be greatly appreciated!

Hey guys, im a month in with my first nano (80l) and hitting a bit of trouble which id love some advice on.

Currently no fish, but added 4 trochus snails 10 days ago to start getting some life in there once cycle was complete.

My LFS recommended adding 2 bags of copepods and 2ml of phytoplankton once a week whilst we don't have fish to (i think) speed up algae growth.

For the last 5/6 days the water has looked a bit cloudy and nitrates have dropped from 18 to around 2 or 3. Chat GPT is saying it could be a bacterial bloom.

Continued in comments...