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Lost all my fish in less than 18 hours!
Have long established 20 Gallon Tropical Fish Tank...
SMALL FISH...3 neons, 2 hatchetfish, 2 Plecostomus (very small) & 3 swordfish.
2 weeks ago I added 2 small angels, clown loach & small redtail shark.
Saturday...within a 12-18 hour time span...I LOST ALL BUT 1 of the swordfish!
DOES ANYONE HAVE ANY CLUE AS TO WHAT WAS GOING ON????
1) You're tank was quite overstocked
2) You added quite a lot of new fish all at once (Did you quarantine them?)
3) You have 2 very messy fish (plecos)
4) Your groups of shoaling fish were too small (tetras, clown loach, hatchets)
5) Some of your fish will become very large fish (plecos, clown loach, shark)
6) Some of your fish are quite aggressive (shark)
I would say that you added too many new fish all at once to an already heavily stocked tank.
First off you may have overstocked it. That is alot of fish for a small tank. Is it a long or short tank?
You really dont give many details. What was your water chemistry? Did you test it? What was their behavior? There are lots of variables. Anything from disease to water quality. Do you do regular water changes? Do you have plants?
Could one have died an gone unnoticed? Maybe caused an ammonia spike?
I am sorry for your loss, I know that is frustrating. Maybe with a little bit more info.
The parasite type bugs were found while cleaning gravel....
Welcome to the fourm Lou.
I merged your first thread that you started with the same post into this one to keep it all in one place.
Sorry about your fish loss. What were your ammonia and nitrIte reading after adding all of those fish at once?
Unless you introduced a new disease into the tank, my guess would be water quality killed your fish. If you added that many at once, your beneficial bacteria wouldn't be able to keep up with the new bioload introduced.
What does filter fairly clean mean?
With that many inhabitants, you should be doing much larger water changes (at least a third or more) weekly with a good gravel vac. and adding a good conditioner like Prime with the new water.
The "parasite bugs" are most likely planaria which is caused by excessive ammonia or nitrates in the water. There were far too many fish and also fish that were too aggressive. You'll need to test the water pretty soon or the last fish will die too. I'd change out 50% or more of the water daily too until everything is back in check.
Welcome to the forum
My guess as to what the parasites are is planaria - a worm but not a parasite. I believe they are an indication that you are overfeeding. That coupled with the addition of the new fish led to water quality issues, is what likely happened. When you lose a bunch of fish in a short amount of time it's almost always water related, and the FIRST course of action to take is a big water change.
I see that you haven't posted any water test results. Have you tested the water?
LEVELS: NITRATE 160, NITRITE 3.0, HARDNESS 150, CHLORINE 0, ALKALINITY 0, pH 6.2
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