Fish Lice Or Harmless Bugs?

Porcelina

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Hopefully someone on here can help me out. Shortly after I bought a fancy guppy, I noticed a huge swarm of very small black "bugs" that seemed to hang out in the gravel and on plants. They had also covered two of my other fish, who quickly died. When I took a small bag of tank water to my LFS to determine what these "bugs" were, the salesperson told me they were fish lice and sold me Life Bearer and Copper Cure. Long story short, the pests kept coming back and I finally had to move all of my fish into a bare bottom quarantine tank and "nuke" their old tank (put in bleach water and crank up the heat for several months).

I thought everything had passed, all of the fish in the quarantine tank seemed to be doing fine. Unfortunately, shortly after I moved my Otto into a new tank, he must have brought something with him; because when I took a plant out of his new tank and put it in my 20 Long, I soon hand ANOTHER swarm of black "bugs"! Since I was out of Life Bearer and Copper Cure, I went to PetSmart and asked about medication for fish lice. This time I bought Parasite Clear. Unfortunately, this does NOT seem to be working AT ALL!

My main question is: can anyone tell me if I actually have fish lice, or is this something different? These bugs are VERY small and don't look like any of the pictures I've seen of lice. They're actually smaller than a sesame seed and can move very quickly.



Tank size: 20 Long
ammonia: 0
nitrite: 0
nitrate: 0
tank temp: 82

Fish Symptoms (include full description including lesion, color, location, fish behavior): Fish seem fine, but several died during past infestations.

Volume and Frequency of water changes: 20% on July 4th, 30% on July 8th

Tank inhabitants: 2 Salifin Mollies, about 20 Molly fry, 2 Gamusia Affinis

Recent additions to your tank (living or decoration): Male Molly and home grown Water Wisteria (from another tank).

Exposure to chemicals: Parasite Clear
 
Have a look at the common pests link in my sig....
I'm guessing Ostracods though without more details its hard to know.
 
Have a look at the common pests link in my sig....
I'm guessing Ostracods though without more details its hard to know.


I went through your Common Pests link and did a Google Image search on anything that had a similar discription to what I have. Nothing seemed to really match. Maybe what I'm seeing are babies and are therefore too small for me to identify. Honestly, they just look like very small black dots swimming around in my tank.
 
Yeah ostracods! All the pics you found would most likely have been enlarged, ostracods are tiny black/brown spots that scuttle round your aquarium....
 
As per the link, small fish will clear them up and an improvement in tank care; more gravel vaccing and water changes may also help.
Careful you are not over feeding.
Good luck.
 

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