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Bugs you might encounter in your aquarium

Zercon

Seedling
Joined
12 Jul 2021
Messages
1
Location
Arizona
This is a wonderfully informative thread that is both nice and horrifying.

Regretfully, I got another mystery to add to the list :c

They are small black dots that sit on the glass bottom of my tank eating waste, and visually pepper silk plants when viewed close. They do not climb glass walls. Using digital calipers, they are somewhere around the 0.5mm range, if that, so they are quite small. Here is a video under a cellphone attachment microscope at 60% or so magnification



I have tried, and they SURVIVE...
-Scrubbing the tank in dawn soap ((Probably missed a spot in the filter))
-Seachem ParaGuard
-Seachem MetroPlex
-Copper Power Green - 1.40 ppm ((Hanna checker))
-Seachem Cupramine - 0.25 ppm ((Hanna checker))

They may be harmless, good for the tank etc etc... but they freak me out a lot because they look like mites and I don't want to put my arms inside the aquarium. Is there a medication that will kill them and not fish that can be purged enough I can put inverts back in after water changes and charcoal? Is there a fish that is small enough to eat them that Angelfish can't catch in a 120? Is there at least confirmation they are not parasites that will harm my fish? I am really unsettled and wish I was ignorant :c Out of sight out of mind...

Bonus Question - I think the copper killed these from my tank, but a positive ID could still make me more comforted if they come back. They were the size of powdered sugar haze on the glass, and this is 200% or so magnification. Makes me think of little planaria, but the size and speed of movement throws me off.



Thank you all for your time! It is greatly appreciated so very much.
 

Wookii

Member
Joined
13 Nov 2019
Messages
2,549
Location
Nottingham
Another bug query if you guys not mind assisting - these came from my outdoor Moina culture, so I assume they’ve been added by a flying insect, but it would be good to know which and ensure they aren’t an issue for shrimp or fish:

5DDC22F6-95FA-4B1A-82F4-2519F714E18B.jpeg


5EFFF05F-AFDB-450F-8348-1FC39907DB09.jpeg
 

dw1305

Expert
UKAPS Team
Joined
7 Apr 2008
Messages
13,049
Location
nr Bath
Hi all,
Another bug query if you guys not mind assisting - these came from my outdoor Moina culture, so I assume they’ve been added by a flying insect, but it would be good to know which and ensure they aren’t an issue for shrimp or fish.
They are type of midge larvae, like "bloodworms", but without haemoglobin, fish are keen on them and they aren't a problem.

Cheers Darrel
 

Wookii

Member
Joined
13 Nov 2019
Messages
2,549
Location
Nottingham
Hi all,They are type of midge larvae, like "bloodworms", but without haemoglobin, fish are keen on them and they aren't a problem.

Cheers Darrel

Thanks as always Darrel. I tried feeding one with some Moina and the fish didn’t know what to make of it as it wiggled about - most swam away from it and it disappeared into the undergrowth! 😂

I tried two more this morning, and the Chocolate Gourami’s plucked up the courage and swallowed them whole! I suspect they now have the taste for them!
 

NotoriousENG

Member
Joined
17 Jul 2021
Messages
107
Location
Eastern USA
Hoping for an ID on these little guys. I'm thinking a nematode? Caught them free swimming (more like twisting and knotting on themselves) before lights on. Have not seen them before but I did disturb part of the substrate yesterday during maintenence.

No fish in the the tank, only shrimp and snails. Only thing added recently was a few aroids from a another hobbyists a week or two ago.
5a1e3558d2a6933dba4a28d34e780894.jpg


Sent from my SM-G970U1 using Tapatalk
 

dw1305

Expert
UKAPS Team
Joined
7 Apr 2008
Messages
13,049
Location
nr Bath
Hi all,
Caught them free swimming (more like twisting and knotting on themselves) before lights on. Have not seen them before but I did disturb part of the substrate yesterday during maintenence.
Sounds like a <"Detritus worm"> (Naididae).
I'm thinking a nematode?
Look at it against the light, if you can see segments it is an annelid.
No fish in the the tank
Fish usually eat them, although they may persist in the filter or substrate.

cheers Darrel
 

MichaelJ

Member
Joined
9 Feb 2021
Messages
1,163
Location
Minnesota, USA
Living at the ocean when I grew up I remember when I started keeping large Cichlids, I would catch and feed them live and frozen krill (mostly not more than 1-2cm). The Cichlasoma's would go absolutely nuts. Not entirely sure this is relevant for the thread as krill is not something you would randomly encounter in your freshwater tank (hopefully), but I do believe even grounded up frozen krill can be a great source of food for a lot of ornamental freshwater fish - I think a lot of flakefood contains krill actually. Living in Minnesota, I no longer have access to live krill unfortunately.

Cheers,
Michael
 
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dw1305

Expert
UKAPS Team
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7 Apr 2008
Messages
13,049
Location
nr Bath

MichaelJ

Member
Joined
9 Feb 2021
Messages
1,163
Location
Minnesota, USA
Hi all,

If I lived near the coast I'd catch and use <"Opossum (Mysis) shrimps"> a lot more. You get huge number of them in brackish conditions.

I think the Crangonyx I have are probably as good in nutritional terms, but in ten minutes I could net more Mysis shrimps than I could <"culture Crangonyx in ten years">.

cheers Darrel
Yes. The Great Lakes have Mysis as well - different from the European species, I believe and not as numerous as found in say the Baltic Sea where they seasonally can be found at some spots in such abundance that the water almost turns into porridge.

Cheers,
Michael
 
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NotoriousENG

Member
Joined
17 Jul 2021
Messages
107
Location
Eastern USA
Look at it against the light, if you can see segments it is an annelid.
I had the worms in my dosing cup which must have some residual trace mix in it since the worms had died and retracted to the size of a grain of rice within an hour of catching them. So I couldn't check them against the light and have not seen any since.

So would you say it's likely safe to assume they are nothing to be worried about?
 

swyftfeet

New Member
Joined
29 Oct 2021
Messages
20
Location
WNY
Found these little guys in my plant growing tank.

Look like tiny white specs about 1/20th the size of a grain of rice that swim really fast
765ECCC7-579C-4E87-B051-9E727E211E33.jpeg
 
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