Whats wrong

[Teresa.H]

Could someone please tell me why all of a sudden my fish one inparticular is turning on other members of the same family is it because hes male!
its quite upsetting to watch and its mainly when ive fed them he starts but carrys on attacking for ages afterwards and only the two females of the same family
my other fish dont get attacked whys this happening

 

[The-Wolf]

hi
we need a bit more information, like species of fish, the number of them, the other occupants, the size of tank etc

 

[Teresa.H]

ok the fish in question is a swordtail ... my tank is a ten gal hexagon tank ive only been keeping fish 7 weeks, so any help is appreciated ..I have 5 neon tetras 4 danios a fighter fish who is very gracious and a sucker fish and the 4 swordtails which up untill last weekend got on swimmingly

 

[kev_kb]

What ratio of male to female of the swords do you have?

Do you know the real name of the sucker fish? This could either need company or may grow too large for your tank.

Also have you tested for Ammonia, Nitrite & Nitrate?

 

[gale]

I'm no expert but that sounds like a lot of fish for such a little tank.

 

[jesssa]

I'm no expert but that sounds like a lot of fish for such a little tank.

I second that. Also the female/male ratio might be a factor?

 

[The-Wolf]

Firstly your tank is overstocked
secondly if the swordtail male to female ratio is incorrect then this is the cause of the aggression.

Thirdly
danios need much much more room than a 10 gallon tank
IMO you need to rehome or return the danios and the betta (fighterfish)
and as asked what kind of suckerfish do you have? If it's an oto then thats fine but if it's not you need to rehome or return that as well.