mystery critters

[Pjanssen]

found these guys swimming on top of some sand that I had removed from the tank and rinsed. Obviously I didn't kill everything cuz here they are, newly hatched, but in fresh water. looks like 2 different species, black one maybe some kind of pod? Any ideas?

 

[Pjanssen]

they are only about 2-3 cm

[debbeach13]

I do not recognize most of those. Did you put the sand back in the tank with the critters?

[Pjanssen]

19 minutes ago, debbeach13 said:

I do not recognize most of those. Did you put the sand back in the tank with the critters?

no. not yet. want to figure out what they are first

[Pjanssen]

Some research suggest the top ones may be some species of bristle worm, but they don't look anything like the bristle worms I've experienced in the past.

[mcarroll]

7 hours ago, Pjanssen said:

You said freshwater, right?   Those look like mosquito larvae.  🤷‍♂️

 

The other photos are harder to distinguish any details....they look like insects too though.

 

[Pjanssen]

2 hours ago, mcarroll said:

You said freshwater, right?   Those look like mosquito larvae.  🤷‍♂️

 

The other photos are harder to distinguish any details....they look like insects too though.

 

this is a very big possibility and initial thought, but i didn't find this link. Thanks!!

I'll try to get a better pic of the other

 

[Pjanssen]

Yep. I'm going with mosquito larvae on the first pic. Thanks @mcarroll for the pics to help me confirm. Still working on the black ones.

[Pjanssen]

decided to just rinse sand again with super hot tap water, after pouring excess water and larve into freshwater tank, of which the freshwater fish seemed a little grateful. hopefully I don't awaken tomorrow to a house of mosquitos! I'd really like to be able to reuse this sand