If you want tank mates for him (or her) you would need a larger tank, you will want a bigger tank anyways because he will get bigger.
I have never gotten piranhas because looking ahead you are very limited for future tankmate options and will be stuck with the piranha until he dies.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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