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Old 09-25-2021, 03:33 AM   #1
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My fish are dying one by one.

I have a 250 Litre tank, nitrates are about 50-70 ppm, our tap water is 50ppm so getting lower isn't feasible.

Nitrites & Ammonia is at 0ppm, Ph is in the high 7's and my water temperature is 26.5c. Really can't see it being oxygen related as it's been fine for months with 2 large airstones, 1000lph spray bar & 1000lph power head moving the surface. Substrate is sand.

Tank inhabitants seem to keep dying at a rate of 1-2 fish per day, it started when I added a pair of Dwarf Gourami, one of which died 3-4 days later.

Zebra Danios are hanging around looking like they are constantly nibbling & some are red around gills & anus, also lost some Kuhli loach, many of which look like they are gasping saw 2 last night sat on top of the powerhead with their heads at the surface, 1 is dead this morning, some of them when i can see them are red around gills.

I've seperated what I can catch into a hospital tank of the Danios & Kuhli, one Danio had his eyes go funny, like white blobs then die & one now has tattered tail but is still wimming.

A friend suggested a parasite med called Praziquantel i think it's called, 1st dose went in 15 hours ago. I have Vampire & Amano shrimp so options are limited.

Anyone else got any suggestions?

So far the shrimp and Otto's in there seem unsffected, there is also a Green Phantom Pleco and he is still doing his thing for now.

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Old 09-25-2021, 03:42 AM   #2
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Sounds like ammonia to me. Nitrates are the smoking gun of previously high ammonia levels. So they may be reading 0ppm now (even though I would never trust a test kit) but they could have been elevated previously.

In any case the best course of action would be to change a large amount of water.
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Old 09-25-2021, 04:14 AM   #3
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Been doing regular 30% changes, it's not ammonia, i've got 2 different kits & test every 3 days. Always 0ppm. 10 Danio, 8 Kuhli, 4 Tiny Otto & a baby Pleco couldn't produce an ammonia spike in a 250L tank if they tried, the filter is rated for 500L tanks too.

The tap water contains 55ppm Nitrate straight out of the tap, that's why i always have some.

It's definately an illness, just what?
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