What are these?

[gstty]

I have these bug looking things on all my glass. They seem to only be on parts of glass that I missed when scraping algae. So I assume they are not harmful as I think they are probably consuming the algae. I did have 3 of my fish get what looked like brook just after I noticed these creatures. Unfortunately the fish died before I could do anything about it. I dont think that these things were what killed my fish. But im unsure. Please help!!

 

[Derrick0580]

Copepods

 

[EeyoreIsMySpiritAnimal]

Copepods

No. Copepods are MUCH smaller.
Does anyone bother to read the sticky threads with all the ID's???

OP, those are munnid isopods

What is that!! A R2R guide to common new tank hitchhikers.

One of the greatest things about starting a reef tank is getting your live rock in and admiring all the diversity within it. The rock comes to life different creatures. This is a guide that I, along with a very well known critter identifier @KJ , have put together for the new reefer on what...

www.reef2reef.com

Guide to Common Hitchhikers in reef tanks.

The purpose of this thread is to hopefully assist hobbyists in obtaining the correct id and method of treatment to common hitchhikers. Both; the good ones and the bad ones. 1) Anemones: Some times called the flowers of the sea, many hobbyists keep them intentionally for their striking colors...

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[EeyoreIsMySpiritAnimal]

And, no, they did not kill your fish.

 

[Derrick0580]

Copepod, isopod, amphipod….all fancy names for free fish food!