Copepods????

Wycco

Eat more pine trees
Apr 19, 2009
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34^N 81^W
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Kim Jong Il
So last night at 2 or 3am after getting up to tell my 2y/o to be quiet and go back to bed for the 3rd or 4th time- I was really awake and had trouble sleeping- ended up turning the filter and air pump off in the tank (doesn't normally bother me but wanted every help I could... don't worry no fish- still cycling- just run it to clear the water and mix things up.


So this morning... (woke late and late for work so didn't get to take pictures) - before I turned the filter on and right after I turned the lights on I noticed these weird little beasties on the glass. I assume I'd never seen them before because they didn't seem to like it when I turned the filter back on and made their way down the glass.

My first thought were "are those little mites running along the glass"- then I looked closer and thought, "no, these must be copepods, I've read about them, they're harmless."

They're between about ½mm to 1mm long... barely visible- had to really strain to see them- could just about make out little almond shaped bodies with two arches off the back.

So first chance I get I google "Copepods"- now I'm less sure I have copepods and wonder if they might be something else- according to everywhere I read- Copepods should be 1 to 3 mm long... I'm not convinced most of mine are even 1mm long- they're barely visible at all- certainly none are 3mm long.

Is there something else that looks like a Copepod only smaller? Or are these really copepods?

Not sure if they hitch-hiker through my tap water (read they are present in many cities tap water) or on my plants- but... I suspect they're here to stay now... (at least until I get fish and they become dinner).
 
Amphipods = Scuds?

I think they're a little small for that- unless these are larval scuds perhaps. Shape wise- from what I can make out (they're so hard to see it's hard to shape them- I'll need to magnify them somehow)- but shapewise copepod looks right... it's just how small they are that makes me wonder.
 
From what you're describing, are the 2 arches off the back like forming a fork like tail. It seems to me that they are just copepods. I got them in my cycling tank as well as they skip around to travel through the water column.

Any I'm pretty sure there are copepods that are smaller then 1 mm and larger then 3mm. There are many many many species of copepods, I'm assuming the source that listed 1-3mm was just a general estimate for most size of copepods.
 
From what you're describing, are the 2 arches off the back like forming a fork like tail. It seems to me that they are just copepods. I got them in my cycling tank as well as they skip around to travel through the water column.

Any I'm pretty sure there are copepods that are smaller then 1 mm and larger then 3mm. There are many many many species of copepods, I'm assuming the source that listed 1-3mm was just a general estimate for most size of copepods.

OK, thankyou- based on their shape I would have guessed copepods... it was the size that was throwing me off... they were hidden by the time I got home- so I guess they hide in the substrate with the filter and light both on. The two arches look like they're coming off the back of the head/body- like a tail or legs.

They move in little spurts...

Can't see any tonight but there were dozens there this morning.
 
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