Acarichthys heckelii

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A larger group of heckelii would be better than 3. A 220g is a good sized tank...I wouldn't worry at all about a couple extra.

There are some ANCIENT heckelii at the National Aquarium in Baltimore that are probably close to a foot and a couple of inches thick.
 
I have a trio of these in my 6x2x2. Got em last year at like 2" now 6-7". Fairly peaceful. Showing great colouration.

They live with a variety of cichlids, have been with rays too.

They are living in water with a of around 5.9-6.0

Eat well on frozen and meaty feeds. Along with Tetra prima, spiruleena flake, and Hikari.

Just my little contribution.
 
My two heckeliis seem fairly mellow, they're about 4-5" now and get puched around my a 3.5" surinamensis. I'm sure they're both males and they seem to get along ok, with the occasional little peck from the larger of the two. They're beautiful fish, and you should definately get some. Sytart with a group and thin them out if/when needed.
 
very nice fish i have one in a community tank with 3 other geos and a bunch of ca / sa fish mine is about 4-5 inches right now. he eats from the surface and bottom great fish
 
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