i love all the people chiming with "i heard this" and "i heard that". lol. not very useful information, especially the people giving out the wrong information.
fact:
- you want them in a group of 10+. while i have seen groups as small as 6 work, i would suggest a minimum of 10.
- the rule of thumb with these fish is, one square inch of fish, per gal of water. now, bare in mind that this "rule" is more of a guideline, and is meant for novice keepers, and people who apparently dont understand this fish very well in regards to aggression and bio-load. while you CAN do more then that, i wouldnt suggest it unless youre able to upkeep them properly with frequent WC and overfiltration.
- they can have tankmates. its not suggested, but is possible. armored cats and larger plecos should be fine. i have plecos in my exodon tanks and theyre alive and well. however, you dont want to put them with larger aggressive tankmates (like the aro mentioned above) who will surely make a quick snack of the exodons. and at $8 a pop, thats one hell of an expensive feeder
- they ARE capable of doing damage to eachother and tankmates. contrary to their size, these guys can be mean, and while you may not see them eating eachother, you will notice them disappearing. and 1 + 1 = 2
- these fish should be added as one large group, if possible. much like piranhas, once established in the tank, anything added after the fact will be considered food. (so to speak). if you decide to add more exodons to your shoal after the initial group, do it in a group of 5 or more, and i also suggest a WC beforehand to help stir things up a little. if you try to add one more to the community after the fact, chances are you may not see that one ever again.
- these guys can eat a ton. make sure you keep them well fed to keep aggression down. if not, even a large group wont stop them from picking at eachother.
for more information on exodons, feel free to PM me, or visit my informative exodon website
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