Wels
I believe a Paroon shark will get WAY TOO large for even a 600gallon....Sure the the RTC is a fun catfish, but it is not an Arowana......An Arowana is a fish legendary for its good luck feng shui properties....The gracefullness of he Dragon Fish is a non to be beat....In fact, three Arowanas will be cool in a 6000....No-tice not two....Having two arows will probably melt into a terrtorial dispue over the mighty tank....Keep us posted with great pictures.....