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Heard spraying oil films with H2O2 will get rid of it. The paper towel works too.

You can clear the oil on surface by placing a paper towel on the surface it absorbs it

How did you clear the oil film on the surface?? Cause that would be a skill to commit to knowledge, just in case.

You have mostly brown diatoms and green algae. Nothing to panic about. Although unsightly to you, the shrimp and more importantly, shrimplets LOVE this stuff. Clearing it out would mean one major source of food for shrimplets will be gone. Your shrimplet survival rate would fall, and you'd end up with less juvies. I would suggest not doing anything with it. Except maybe reducing your photo period to no more than 8 hours a day. An otto would devour this type of algae as well. But that would mean less for shrimplets. What shrimps do you have? And have you not noticed shrimplets (new born) grazing on this?

Welcome to the forum, so cause i told perplex does that mean i technically told you about the forum ;) lol j/k Am sure you will enjoy it on here and find plenty of useful info

Good to hear.

Rinse your sponge filters if you have any in the tank aswell and put them in the bucket for the shrimp.

You could try using a fine net to catch the particles of dip out. As you suggested it might be a good time to reset the tank anyway. I would set up a temporary container with RO and salts to approx the same parameters as your tank, making sure temperature is about the same. Then use the new water to drip acclimate your shrimp over 6 hours or so to the new water, then move the shrimp into the temporary container. Then reset your tank. If parameters are as simialr as possible, losses should be minimal, even for new shrimplets. At least far fewer than if there is an ammonia spike in your tank.