search google for 'CAE'
or chinese algae eater
the problem with these fish seems to be the way they change their diet from
algae to things higher in protien as they grow.
loves a good snack of fish slime.
They can also get very very 'chasey' or territorial. I keep some in with
Malawi mbuna like Mel. Auratus as they actaully breakup fights between these
battle tank fish!!!
So a coupla things you can do.
1)add more chinese sucker fish (although in that 20gal maybe not the best
idea) so you have them attacking each other
2) get rid of the bloody thing..... they work well in aggro tanks
3) try get more food into them

I would try get rid of it and get a 'saimese flying fox' if you like that
sort of fish shape or a bristlenose catfish if you like the algae eating
habits.
either way google will give ya lots of info on them as they are a very
common fish and a very common problem!
:-)


"Taylor" wrote in message
...
I have a 20 gal tank with 3 tetras and a sucker fish. It is gold, but
don't know the name, I think Chinese sucker fish. There are also some
snails in the tank.

I bought the sucker fish and it was fine for a month. Now, however, the
sucker fish is constantly attacking the other fish. What is the problem?
Is there anything I can do?