Dead Fish! Please Help! - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 6 Old 08-12-2012, 02:28 AM Thread Starter
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Dead Fish! Please Help!

Beginner here... I have a 15 gallon freshwater tank with :
Current tank:
2 small glofish
2 bleeding heart tetras
2 white skirt tetras
2 long finned serpaes
1 sunsest platy
1 lyretail molly
1 small catfish
(Deceased: 1 dalmation molly, 1 balloon molly, 1 platy
Temperature: usually 84-86... but i turned my heater down a bit today as it's been hot
pH: 6.5-7.0

1 tall live bamboo plant
1 anubias variety plant

The beginning of my troubles started when my daylight spectrum bulb went out and my local store kept me waiting 2 weeks for a new one, and I did not think to remove my live plants, thus the ammonia started. For about 3 days the levels were steady around .5 ppms. I got rid of the plants changed the water 2 times a day for 2 days and the ammonia went away. Nitrites and nitrates were fine.Two days later my favorite dalmation molly died, he was sitting at the bottom and showed no other signs of stress, it may have been that he was old. I was very sad and took a drive to a real pet store to get new plants and I succumbed to getting new fish, which probably wasn't a good idea, but my water was stable. So three days later the balloon molly dies but he seemed very happy the whole time he lived and my water remained stable. I found him upside down with his fin caught in the filter tube, and I think it was just because he was stupid. 4 Days later one of my platys died, doing the same thing as my dalmation molly! Hiding at the bottom, but still swimming up for food and showing no other signs of stress. Now my other platy is acting similarly, perhaps lonely? But it is swimming around and eating, not sure of the sex. The lyretail molly which I'm pretty sure is male, is the only one of its kind. He doesn't seem aggressive, but maybe he is stressing the other fish, causing the deaths. The lyre tail molly occasionally darts quickly, rubbing his belly along the bamboo leaves. I know that this could be an indicator of Ick, but I have not seen any other signs on him or any of the other fish. Very confused, please help! Basically my questions are: What is wrong with my tank?!?! Should I get the lonely platy and lyretail molly friends or leave it alone?
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post #2 of 6 Old 08-13-2012, 05:52 PM
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Sounds like you have a parasite not necessarily ick. Add salt and treat for parasites

55gallon T5 lighting 2 54w bulbs one daylight 10k, one actnic.
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post #3 of 6 Old 08-13-2012, 10:03 PM
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Do not add anymore fish until everyone is healthy.
Your tank is way too hot also. Try 75F for starters if you can..

taking a break from fish-keeping.
3 lovely male betta still keep me company.
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post #4 of 6 Old 08-13-2012, 11:57 PM
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Too hot I agree but sice he has an affliction of some type dropping the temp now would have adverse effects in helping the parasite. 75 degrees is the max for glofish but the others 79 is their max temp

55gallon T5 lighting 2 54w bulbs one daylight 10k, one actnic.
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post #5 of 6 Old 08-14-2012, 11:58 AM
Olympia's Avatar
Yes but I think bettering their conditions will help. There will be much more oxygen at the lower temperature than right now.. Of course take it slowly..

Also there's the chance that it won't even get that low, depending on how hot it is where the tank is.

Is your ammonia still high? I feel like they're suffering from ammonia, .5 is bad...
Otherwise.. if it does turn out to be ich you'd have to raise the temperature.
(I just read the whole post, lol).

taking a break from fish-keeping.
3 lovely male betta still keep me company.
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post #6 of 6 Old 08-14-2012, 01:08 PM
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There is nothing in the original post to suggest parasites to me. I think the issue is different.

Almost all disease and health problems in a fish tank are due to stress. And there is a lot of stress going on in this tank. A 15g is not sufficient space for all these fish. Some of them need a group (the tetra) or they will be stressed and likely to be aggressive. Even if they do not physically attack other fish, they are sending out allomones and the other fish are reading them.

Ammonia at any level above zero will stress fish. And molly are especially sensitive to ammonia, so that likely weakened them.

No mention is made of the hardness (GH) and pH. If these are lower than what the livebearers require, that adds further stress as it affects the fish's physiology. And the higher temperature played into this, as fish have to work much harder the higher the temperature. More stress, and more weakness.

Lower the temperature to around 77F. Do a partial water change of maybe 1/3 the volume. Do another tomorrow. Go from there.

At the same time, take a look at your stocking, as there are problems as noted above. And there is absolutely no room for more fish without removing some of what is there. We have fish profiles, second tab from the left in the blue bar across the top of the page, and these fish are all there. Data on minimum numbers, tank sizes, compatibility issues, etc. are included.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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