Aggressive Platy

uagrad89

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I have a problem and am not quite sure what to do about it. This post is kind of long, so please bear with me.

We are relatively new to aquariums, but I had one when I was growing up (when there was a lot less information available!). Our tank now is a 10 gallon tank, we check the water and do water changes frequently and everything is fine. We started out with a single guppy after the tank cycled. We then added a male Mickey Mouse platy and shortly after that the guppy died. We then added a swordtail, who died after just a few days. We added a Sunset Fire platy (female, we think, although now I'm not so sure), but the original platy seemed to chase it a lot, so we recently added two more platys (both females, we're pretty sure, although we were told by the girl at the pet store that they were both females but one doesn't have the distinct fan-shaped fin like females are supposed to). Anyway, the first platy continued to chase the Sunset Fire platy, although not as often. I didn't see them bump each other a lot, but the Sunset Fire platy would hide out inside a building we have in the tank a lot of the time for about a week and the last three or four days has gone downhill really fast. In fact, by the time I finish typing this message, I'm probably going to have to go remove it from the tank. He/She/It is just laying on its side on the bottom. Lips are still moving, but it's not doing much else.

We're having so much trouble keeping fish alive (except for the original platy, of course) that we named the last two fish Thing 1 and Thing 2 so we wouldn't get too attached. :)

We are wondering about moving the original platy to his own tank. He seemed perfectly content when he was by himself so we thought we might try that and see if we got more life out of the fish that we are adding. We have a 2-gallon tank available. My first question is, is that too small to move him to by himself? My second question is, if that is not too small, can I transfer about 1.5 gallons out of the existing tank and then add .5 gallons of new water and put him in there directly without going through a cycle? I'm thinking that he is the reason for the short life span of the other fish we have had. We don't want to get rid of him but we also don't want him to keep killing any new fish that we get.

Any advice would be greatly appreciated.
 
well would you be able to give your water stats because platys are peaceful fish and this behavour is not normal. some times they may become slightly agressive if there are too many fish or the water. awhile back someone had a simular problem because the ph was high. do u have any shells in your tank because that could raise it by 1
 
Can you check the water stats one more time and post the reading ..... Are you sure there is no bacterial infection or any parasite infestation ? I don't think one single bully fish can kill so many other fishes by just chasing them ...
 
Can you check the water stats one more time and post the reading ..... Are you sure there is no bacterial infection or any parasite infestation ? I don't think one single bully fish can kill so many other fishes by just chasing them ...

There isn't any evidence of bacterial infection or parasite infestation. Anyway, the one fish has been fine all this time, so it seems like if there was anything it would have affected him already, and he seems to be doing great. What water stats should I post? We use the Quick Dip tests - one is a 5-in-1 and tests for ph (stays around 6.8), alkalinity (usually between 80 and 120), water hardness (soft), nitrite (0), and nitrate (20). We also use one for ammonia, which is typically 0.

There are no shells in the water. Some plants, a little building, and an air stone are all that are in the tank.

What about relocating him to his own place? He was an only fish for quite a while and seemed perfectly happy that way. Is there a minimum size tank I should move him to?
 
The evidence is circumstantial. I wouldn't convict your platy of homicide just yet. Let's see how the most recent two do.

I think tank cycling is a tricky business. I started about six months ago and all the fish I added before March are now dead. My stats seemed fine, no ammonia or nitrite anyway, but things just didn't go well. I kept introducing fish as the originals died, added some plants, and very aggressively used "medicine" when I saw things that appeared to be infection. The fish just stopped dying, and now my tank has been stable for several months with a pretty big bioload.

I think you have to hang in there and let some time pass, and don't get attached to the first couple of fish. If the platy is taking chunks out of the others, by all means remove him. But chasing fish around doesn't kill them unless there are other problems.
 
i had a psyco fish, i made him go peaceful after scaring him, basically when hes chasign a fish or being agressive tap the glass , it sounds liek a really bad idea, but he has never nipped fins since i taught him how to behave, we have successfully had more males than females in the tank but thats just me
 
i had a psyco fish, i made him go peaceful after scaring him, basically when hes chasign a fish or being agressive tap the glass , it sounds liek a really bad idea, but he has never nipped fins since i taught him how to behave, we have successfully had more males than females in the tank but thats just me

I'm going to rant here a little bit, just to make me feel better, so here goes.

We, as a family, have come to the conclusion that the fish hobby is just not for us. We - my wife, 7 year old son, and I - get very emotionally attached to our animals and consider them part of the family, not just pets. This deal with just throwing fish away, buying new ones if others don't live, wondering what in the world is wrong with them - that's for the birds. We've lost 3 so far in 5 months and we're going to give it up. We got rid of one last week (related to this thread) and now our one that we wondered if he was the problem is hanging out at the bottom of the tank and not moving much. We have two other females and one of them is listing to one side. The other one is fine, so far, but I'm so frustrated I don't even care anymore.

I had fish when I was growing up and that was in the mid 1970s. I know my mom and older brother didn't do any research on how to do things. They just bought fish and dumped them in the tank. I'm sure the tank was never treated or cycled or any of the other things they say you have to do and the fish we had then did fine, at least better than what ours are doing. My wife and I are both college-educated and have researched what we should do exhaustively and it doesn't seem to matter.

After this, the only fish I'm going to deal with in my home are going to come from my grill. :)

The rant is over. Thanks for everyone's help.
 

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