03-02-2015, 08:38 AM
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Hanging out in corners struggling to breathe isn't normal. Lack of oxygen in the water is what it sounds like, or some serious stress. From what I can't say. Could be a number of things from other fish bullying it, to water stats bouncing or being off. Temp is wrong....adding in water too hot or cold during changes, or changing too much can shock them and stress them out.
From your first photo I can tell you your nitrates are high, that's not good for them. You want it below 20, 0 is best but they can usually handle it up to 20.
Mollies like warmer, harder water than glofish do( need temps 78-82F GH 15-30, in between there is the best, they like it hard, PH 7.2-8.0, KH 25-40, nitrite and ammonia need to be zero, nitrate should be under 20ppm. For tetras, the black skirt ones that have been modified: prefer temps 75-80F, KH 5-10, PH: 6.0-7.5 GH, 5-20 they like it much softer...now the zebra danios are a bit different, they like it cooler between 70 and 75 degrees, PH: 6.5 - 8, water hardness between 5 and 25 degrees, KH: 8-12) and like glofish need room and a group of four or more(I believe it's five or more for glofish). Without proper space, water stats and a group you'll having nothing but stressed out fish.
Mollies typically live 3-5 years as do black skirt tetras(they are usually the wider bodied glofish, danios are the longer more torpedo shaped ones), but danios(zebra danios to be more specific are the genetically altered glofish ones) can live 4-6 years I believe....however, glofish are genetically altered fish for that look and are not anywhere near as healthy as the originals, so I do not know age average for them, but I'd guess it's similar or less than mollies.
So make sure all your stats are where they should be and that you have the right critters with each other. The wrong type of water can really mess them up, and what's more, mollies like brackish water and neither danios or tetras will appreciate that. lol
Temp being off is you're most likely culprit for any molly issues, they like it hot and if it's not it freezes their metabolism, making them slow, not hungry, and what they did eat may rot in their bellies eventually killing them.