Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Maybe. Can you add a better picture?
The fungus grows white but can collect dust, so turns grey. It is soft and gooey, has no real structure (no stems or roots) and it is pretty easy to remove.
Black Beard Algae is much darker, though individual strands might look lighter. Usually you cannot really see a single strand; it grows in a mass. It clings really well. Almost impossible to remove. While botanically it does not have stems and roots in the same way as higher plants, you should be able to tell that there are some sort of structures.
Ammonia: The best way to deal with it is to do water changes, but the new water must have no ammonia. Tap water treated with chloramine has ammonia.
Dechlorinator will lock up the ammonia, usually long enough for the nitrifying bacteria to deal with it, but for fry in a new set up you might want to start with RO or distilled water that you know has no chlorine or chloramine. Then add just the minerals you need to make it match what they were in before.
Nitrite: If the test shows NO2, then add salt (Sodium chloride) at the rate of 1 teaspoon per 20 gallons. This is a very low dose, OK for most salt-sensitive fish. Salt can also relieve stress to some extent. For a soft water species, though, I would not add salt unless there was an obvious reason like NO2 or Ich.