What creatures are this inside my tank?

[Drewman303]

Hello everyone! I'm new to the hobby and I have some questions regarding some small creatures crawling around my tank. they're small white bugs and some of them look like worms(I'll include pictures) My live rock also has green algae, I don't know if that's good or bad. Thanks for reading!

My Tank is the Fluval 13.5 gallons FOWLR I'm not using RO/DI water. it's been Running for about a month now.

 

[RedGabino]

First and third fotos shows amphipods, great to have it. Second picture is GHA (green hair algae), not so good but is ok.

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[Pandagobyguy]

What he said but ill also add that GHA (green hair algae) absorbs nutrients from the water column and so are kind of a "filter" in a way. An ugly one though....

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[mcgyvr]

bookmark/read this for your knowledge..
https://www.lionfishlair.com/hitchhikers-guide/

same here..
https://www.reefcleaners.org/nuisance-algae-id-guide

The critters are harmless/beneficial..
The algae is pretty darn normal and ok now.. part of the ugly stages of a new tank..

Depending on whats in your tap water the choice to not use RO/DI might be a problem down the road or it won't..

 

[thegrun]

I suspect the algae is Bryopsis, a difficult algae to control. We would need a better picture for a positive ID, but if it is Bryopsis I would remove the rock and carefully scrape all the algae and its roots off the rock. Any small piece that breaks off will reattach itself elsewhere and grow, so be sure to remove it all and wash off any pieces that break off.