Emerging Aggression!

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HellishHybrid

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In my 10 gallon tank reside 4 glofish, 5 Sunburst Tetras and 2 Albino Corys.
My problem is thus: Recently some of my fish (Mainly the Glofish) have begun showing signs of agression that was not prevalent when I first got them. They have already (I suspect) killed one of thier own number (I used to have 5 and found one dead) and one of the Sunburst Tetras. Its really getting to be a problem, you see, as they began thier relationship very well, for the most part ignoring the others (Except for the Tetras, who tend to school together). But recently the Glofish have begun attacking each other, and it has led me to sequester the agressive ones, only to have another emerge as the aggressor! Oddly enough, the "Prison Tank" that I have set up is a tiny 1.5 gallon tank, and when I place 2 of them in there together, (Because one was the origional aggressor, and the second because it became a target of aggression.) they got along fine! But when one began acting aggressive recently, after a month of having removed the agressive Glofish, and the "Victim" Glofish into the small tank, I found one of my Tetras dead from obvious attacks. So I placed the 2 from the "Prison Tank" back into the main tank and removed the new aggressor to the smaller tank, the origional agressor began attacking the others again, and when removed to the "Prison Tank" he calmed right down again!
What the heck it going on in my tank? Is this some kind of battle for dominance that I will have no control over? Is this a fish "Race war" (all of the Glofish are different colors, but the fish store atendant told me this shouldnt be an issue.)? Are my fish simply doomed to kill each other again and again until I've lost them all (Even the Tetras are starting to agress towards each other now!). Or is it maybe something in the water (My test kit indicates that things are as they have always been!)?
My only logical solution I can come up with may be to remove all Glofish into the "Prison Tank" and hope for the best (Despite overburdening the ecology of the tank.) and I would rather find a way to keep most of the fish in the big tank (10 gallons) rather than having to move them around every so often.
Oh, and before you ask, the Corys are just fine, neither agressivg nor suffering from the attacks of the other fish.
 
1. I think this "prison tank" is a very bad idea, especially considering it's only 1.5 gallons, which is really too small for any fish, and the stress to the fish due to handling and the sudden change in surroundings could cause problems 2. Please can you post your exact test results here 3. Glo fish are genetically modified danios, and danios require a long tank (150 litres minimum) t0 be happy, as they are naturally fast and active fish.
 
am i right in thinking glofish are like zebra danios? dont they need alot of swimming room? i dont know what a gallon is but it dosnt sound like alot of room, maybe im wrong

whoops that'll teach me to refresh the page, LOL, at least i was right :lol:
 
Like has already been pointed out, Zebra danios (GM Zebra Danios included) need a lot of space, they are fast and active and love to skip about and play and chase in flowing water, kept in too small a tank, they do tend to get pretty aggressive with each other and other fish in their already limited territory.

Perhaps think about returning them for a more suitable (and considerably less stressful!) species? Or get a bigger tank :p

Temporarily, adding some more decor higher in the tank, plants etc to break up the territory might help...
 
Sorry I havent been on, I ate something that gave me food poisoning and have been recovering for the last few days. Ironically, I think it was a piece of Tilapia that did it to me... (Fish revenge, eh?)
Okay, just found out that my testing supplies are useless. I was about to test again when I noticed a date on the back of one of the testing tablets wrappers. Turns out they expired in 1999, and the package information leads me to believe that the testing supplies (given to me along with the tanks by a former roomate) were made back in the 80's or 90's. So I've thrown them out and I plan to buy NEW testing supplies, meanwhile I'll take advantage of PetsMart's free water testing until I can get them.
I did away with the smaller "Prison/sequester tank", which was admittedly a bad idea. I placed all the fish back in together after making a full water change, though I plan to eventually rip the tank apart and completely redecorate with some of my larger plants (which are in the Gourami tank right now) in order to, as was suggested, break up the territories.
Oddly enough, the fish seem to be on 2 "teams" now. They consist of Pinkie and Blue (who are sleeker) and Red and Yeller (who are fatter). Is this an indicator of male/female? Its the first time I've owned Danios, though I have owned Tetras and catfish in the past, as well as certain species of trout and carp.
I also have begun to notice that the fish are "Aggressing" at a different level now. They go after one, only to have it's teammate rush in and chase them off.
I figured a 10 gallon tank would be good enough to use for them. Its about 2 1/2 feet long, so I figured they would have no problem, plenty of room... They didnt start out aggressive, it's just a bit concerning to see them become aggressive. I'd hate to have to adopt them out...

Also, I doubt the store will exchange them, I've had them for months.
 

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