Here's a pic of one of my similis males

Nannostomus beckfordi | Gold line Pencilfish/ Beckford's pencil fish, Gold pencil fish, Golden pencil fish | 5.0 - 8.0 | 21 - 27c | Article |
Nannostomus eques | Hockeystick Pencilfish/ Brown/Rocket/Brown-tailed/Diptail/Tubemouth pencilfish/ Poeciliobrycon eques/ Poeciliobrycon auratus/ Nannobrycon | 4.5 - 7.5 | 22 - 28c | Article |
Nannostomus beckfordi | Gold line Pencilfish/ Beckford's pencil fish, Gold pencil fish, Golden pencil fish | 5.0 - 8.0 | 21 - 27c | Article |
http://www.environment.gov.au/biodiv...mport-list.pdf
however they may have been on previous import lists, have entered Australia prior to the implementation of import lists, or been misidentified on importation.
The IUCN Red List reports Neolamprologus similis as a species which has not yet been assessed at 20/10/2013:
http://www.iucnredlist.org/search
It is very important not to release any aquarium specimens into our waterways. Any that are not sold or re-homed/ given away, can often be re-sold to aquarium stores. If they are homed in ponds, care should be taken that they cannot escape in run-off into our waterways. Even if fish are native & local they should not be moved from one waterway to another, as this can transfer disease. If they are not local fish, they can both spread disease and either out-compete or eat local fish, shrimp & plants, causing their demise.
They are different to community tank species…..very easy to keep and breed….
Best kept in species only tank….they are step breeders, several generations will happily live together
the more the merrier…once your have a pair….they will soon turn into a colony!
It is obviously possible to keep them as a pair in a planted community tank in water suited to plants….but in my opinion you won't get to enjoy their full potential
Give them their own tank with no plants, a substrate of shells 3 to 4 deep, hard very alkaline water and watch a metropolis grow and interact!!