![]() Probably, your aquarium would work better with fewer fish and fewer species. The tetras want to be in the same place, so conflicts are likely. For example, zebra danios are fast swimmers that stay mostly in the mid level of the aquariums. You may also want to consider compatibility issues. A crowded aquarium has little room for errors like overfeeding or a missed partial water change, and too many fish can overwhelm the nitrogen cycle. This may be one reason for both the aggression and fish losses. This should answer your questions about the nitrogen cycle:įrom your posting, the aquarium may be overcrowded or at least near its biological load limit. breaks my heart every time i find another gone. the black neon tetras were the size of the first joint on the pinky. the danios are about as long as the first two joints of your pinky. I change 20-25% of the water once a week, and feed them once a day again. There are 13 danios in the school right now, with the pleco, 2playtys, and the 2 remaining tetras. a different danio than the old bully immediately took off after the tetras. I pulled all the fish out and made them sit in bags floating in the water for an hour, releasing the new fish first. i bought 5 large black neon tetras at the same time. last week i went to the store and got more zebra danios, thinking they just needed more in their school. could they have been hungry?Īfter my first neon tetras died, i added 5 rainbow tetras, of course they all got killed, except one. that was the week the danios started chasing and nipping the tetras. she literally said 2 or 3 flakes 2 times a week was more than enough. she said the rule of thumb was if i saw a piece of fish food float from the surface, it was too much. i fed only as much as they could eat in 1minute. After checking everything, i asked the clerk at a fish store what might be wrong. about a week after adding my fish, the water always had a green tint. I thought of something that might be relevant. Was the tank cycled before adding fish? How often do you complete partial water changes? How big are they?Īm I supposed to cycle the tank every time I add new fish? I only cycled when i started the tank three months ago. Check for ammonia, nitrites, and nitrates. Something in the water may be agitating the fish and making them more aggressive. Here is a stocking calculator to help not to overstock.ģ. ![]() As counter-intuitive as it sounds, you could try increasing the school size (space depending) of both the regular zebras and the glo danios to 6 or more. This breaks the dominance chain and allows for a different leader.Ģ. With bullies, sometimes it helps to remove them from the tank (like with a breeder net) for about a week, rearrange the decor, and then reintroduce the bullies back in. Bullies exist in the animal world just like with people. Although fish species share general characteristics, just like people, individuals have different personalities. And yes, once a fish has passed, it does become food for the other fish.ġ. Fish in too small of schools may try to satisfy their own social needs by "aggressively playing" with the other fish, which will in turn stress those fish, sicken them, and potentially kill them. Since the glofish are genetically altered zebra danios, however, they may not school together as they would with a pure school. They do seem aggressive towards one another, though, as the school develops a hierarchy of dominance through fin nipping and other "aggressive play."Įight specimens in a school should be enough to keep the other fish safe from their aggressiveness. Danios typically are not aggressive towards other fish unless their school is too small. ![]()
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