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Agree and totally forgot to mention that. It is chasing your Cory's because it is exhibiting aggressive behavior because it's stressed out on being by itself. If your tank is big enough I would increase the numbers, if it is not big enough I would rehome the SAE. The minimum size tank to have a group of them comfortably would be something larger than 90 gallons in my opinion. I do have a group of six in my 125 gallon tank and one of them is currently a little over 4" the other five are slowly growing into their adult size.Welcome to TFF
How many SAE are in the tank? This is a shoaling fish, and will exhibit skittish behavior in groups of less than six
Not only do they need to be in groups, but they can grow close to 6 inches in length, a four foot tank should be the smallest tank length to house them
Crossocheilus langei – Siamese Algae Eater (Crossocheilos langei, SAE) — Seriously Fish
www.seriouslyfish.com
Agree and totally forgot to mention that. It is chasing your Cory's because it is exhibiting aggressive behavior because it's stressed out on being by itself. If your tank is big enough I would increase the numbers, if it is not big enough I would rehome the SAE. The minimum size tank to have a group of them comfortably would be something larger than 90 gallons in my opinion. I do have a group of six in my 125 gallon tank and one of them is currently a little over 4" the other five are slowly growing into their adult size.
So, I agree with whistlingbadger that it may not be the end of the world.SAEs are kind of cool, but they're the most misnamed fish in the hobby, in my experience. I kept a single one in a 55 back when they were fairly new to the hobby and nobody was saying they needed a group. He was fairly well-adjusted, neither aggressive nor shy. But I never once saw him eat any algae.
You did mention aggression towards your Cory's. If you see my tank I have a lot of bottom feeders and mid water fish but my SAEs don't show aggression to the loaches, plecos, barbs, gourami or gudgeons. They just enjoy each other and I haven't even seen aggression between the six of them.I kept two before. I know the general consensus is that they need large groups and a massive tank, but after a few years, I found them to grow very slowly (with plenty of space and a healthy diet) and never demonstrated stress or aggression when in a tank with only two of them.
I know I can't measure fish happiness, but colors were good, no signs of stress, no illness, and no deaths. They were added to a friends tank when I had to give up my larger aquarium and have had no noticeable behavior changes even though they're now with 12 others. They actually seem to keep to each other more then the rest!! Super cool fish. Worth getting another. Or maybe giving it up entirely if you seem to need 6+
So, I agree with whistlingbadger that it may not be the end of the world.
EDIT: I want to be clear I didn't *know* they were recommended to be kept in large groups when I got just two-they were all my fish store could get and I found the same websites you did saying one would be ok