This is a discussion on Biter Goldfish within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; -->
I have four Goldfishes. My problem is, one of my smallest Goldfish is a biter. It tends to bite one particular Goldfish ...
I have four Goldfishes. My problem is, one of my smallest Goldfish is a biter. It tends to bite one particular Goldfish leaving it very sad and laying and hiding only on the bed of the tank and not swimming much. Only consolation is when food comes. It would swim up for food and then hide again.
What should I do? should I separate the fish? if so which one? the biter only attacks one particular fish....
I've seen this happen before under a couple of different circumstances. The most common is when a goldfish becomes ill, other goldfish will pick at it, knowing that the sick fish is a potential food source. Is the goldfish that is being picked on exhibiting any signs of illness?
Other times, you may, indeed, just have a nippy fish on your hands. The only thing you can do with a nippy fish is isolate it. If that is the case, perhaps you can trade it in for a less nippy model at the fish store. If you're particularly attached to it, consider separating it with either a divider (which I usually only recommend as a temporary solution), or a separate tank.
You could try separating them via a tank divider first, to give it some time. The behavior may stop naturally in the future, but if the two fish are kept together undivided, it might cost a fish to find out. The tank divider option would be alot cheaper than setting up a new aquarium, albeit somewhat aesthetically unpleasing. Tank dividers only come in so many sizes though, and you'd have to find one that will fit.
I'd be very careful and watch them closely, I had gotten 6 goldfish, one of them was pecking at the littlest, and he ended up being seperated but died anyway, and then the same vicious goldfish I noticed attacking my largest, who also passed shortly after, I rehomed the violent on, and the remaining three have all been fine since then, so if you're attached, i would take the safe route and re-home your biter.
You can make your own divider out of transparent acrylic sheet.
Cut it to size and then use a drill to make a ton of holes. It's 100 times more aesthetic than the dividers you can buy.
Something like this but with many holes:
(MANY MANY HOLES!)
And the low part of the divider can be covered with sand or whatever you use in the tank.
And best part is that it's transparent!
Plexiglass dividers are extremely nice. I used to make those to separate 55 gallon tanks into three quarantine units. Throw a little silicone in there, and you can make a really nice set of loners out of a cheap preowned 55.
Not sure you need silicone, if you make the divider with a base like in the pick and you put the base directly on the bottom of the tank and then the sand over the base it should not move unles you keep some really big, strong and mean fish in there