how big

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how does it hurt itself?
 
If a smaller gar gets spooked in a big tank there is much more room for it to build up speed when speeding across the tank, causing a collision with the glass to be much more dangerous than if it were in a smaller tank. These can result in broken spines/backs/snouts and what have you.
 
it will be about one foot long is this size safe? also instead of a catfish how does a clown knife sound? will both fish have enough room to swim when fullgrown. I hate over crowding my fish and usually understock on purpose.
 
Gars are usually aggressive towards knifefish, from what I have read. I've never tried it myself.
 
With the african/asian species of knife fish I have not had issues when I had them with gars in the past, provided the fish were of similar size. With a clown knife you have to watch out as some clowns can be quite aggressive. It's a combo that can work but you would really have to keep an eye on.

The african/asian species that I have housed with gars in the past were clown knives (regular, and golden), royal clown knife and african brown knives.
 
I want either a royal clown or a bgk. I thought gar were peaceful
 
I am not sure why you thought that. They are large, predatory fish with two rows of teeth.
 
yes well I meant peaceful toward any fish to big to swallow.
 
Oh... nope... they can't swallow 99% of tankmates because their jaws allow for a very small gape. Even big gars can't eat many small fish. That does not stop them from killing them though.
 
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