Wow your tank for a 4 gallon is WAY over stocked, ammonia levels likely killed your betta or the other male. They can sometimes get along and then one day rip each other to pieces. I would suggest getting a 10 gallon tank and keeping the surviving betta alone in the 4gallon tank.
Also it does look like a tubifex. How often do you clean your tank? Does it have a filter? Are their live plants?
Last edited by LadyVictorian; 09-19-2012 at 06:12 PM.
wow, i'm sorry for your loss but that tank was and still is a ticking time bomb. you've basically got the equivalent of a group of cats, rabbits, dogs, chickens and a pair of angry bobcats all being shoved into a seedy bathroom stall and hoping all goes well. if you're serious about keeping them, get at least a 30 or 40 gallon tank for them, and take better care of it. if not, see whether the pet store has a return policy, or sell/adopt the remaining fish on craigslist or some similar site. i'm sorry if this sounds harsh, but it's just the truth.
wow, i'm sorry for your loss but that tank was and still is a ticking time bomb. you've basically got the equivalent of a group of cats, rabbits, dogs, chickens and a pair of angry bobcats all being shoved into a seedy bathroom stall and hoping all goes well. if you're serious about keeping them, get at least a 30 or 40 gallon tank for them, and take better care of it. if not, see whether the pet store has a return policy, or sell/adopt the remaining fish on craigslist or some similar site. i'm sorry if this sounds harsh, but it's just the truth.
I agree, those poor things are living in a tiny box of doom. 4 gallons o.o that's only enough for ONE fish, that's smaller than my tank. Mine is a 5 gallon and that still is a small tank. Just so sad. If you can't I would be happy to take your remaining betta off your hands and give him a good home. I have an empty 10 and 20 gallon tanks and I was going to buy a 2.5 tank for a baby anyways. Plus I have some spare stuff from Aquarius that he no longer needs now that I am upgrading his stuff.
The other betta could of killed it, and you probably didn't properly care for your betta and the levels got higher killing your betta. Please, do a 100% water change and start over and you cannot put 2 male bettas in the same tank without it being divided, and a 4 gallon is way to small for 2 bettas.
That worm does NOT look like an earth worm, it's very off from a 'earth worm look' and how the heck would an earthworm climb a tank and go in it? They prefer to say in soil and would never be in a tank unless put in there, so it's something else.