Algae ID on a new tank - which specific ugly is this?

[cowfootball]

Diatoms? I’m about to go away for a week so waiting it out won’t be too hard. ;)

Tank is ~5 weeks cycled (i.e., 4ppm -> 0ppm in 24 hours multiple times before adding fish). It now houses a YWG and 2 Clownfish. Phos/Nitrates are on the high side, I guess.

Ammonia 0
Nitrate 11.3
Phos 0.18
Calcium 390
Alk 6.4
Magnesium 1245
Salinity 1.025
pH 8.3

 

[Lavey29]

Edited after OP edit.

 

[cowfootball]

Fish in cycles are incredibly cruel to the animals.

Cycle has been done for weeks and was done without fish. Tested 4ppm of ammonia > 0ppm in 24 hours 3 times before adding fish.

 

[Lavey29]

Cycle has been done for weeks and was done without fish. Tested 4ppm of ammonia > 0ppm in 24 hours 3 times before adding fish.

That's good, your post didn't specify that and it's just normal new tank diatoms nothing to worry about. Goes away in a few weeks. Your alk is a little low. Verify salinity with a calibrated device.

 

[cowfootball]

That's good, your post didn't specify that and it's just normal new tank diatoms nothing to worry about. Goes away in a few weeks.

I can see how it could read that way. Edited the OP for clarity for future readers.

Okay, great, that was my assumption, thanks!

 

[Lavey29]

I can see how it could read that way. Edited the OP for clarity for future readers.

Okay, great, that was my assumption, thanks!

You can minimize lights while you are gone if you want to hold the diatoms off till you get back. Fish don't need lights.