I sold all my wild and F1 breeder L260 so I can't help you there but I do know that
http://www.wetspottropicalfish.com/index.php/fish has some wild specimens for sale at $60.00 each.
I originally bought a dozen wild L260 which eventually gave me breeding stock.
I eventually bred both the wild fish and my F1's. It took about two years before my F1's began spawning.
They are just like H. zebra, imo; small spawns of 10 to 17 fry depending upon their age and about the same degree of difficulty.
The fry seemed delicate to me and they grew slowly at first but I think they reach maturity at about the same age as H. zebra.
At first I used mostly RO water but eventually mine bred in my tap water which has a pH of 7.4 and about 350 to 400 ppm TDS.
I have found that all the Hypancistrus species I've bred eventually would do so in my tap water as did my
.
I think showing that degree of adaptability is encouraging and can simplify things from a maintenance perspective.
I also concur with the assessment that you have all males.
Avid Trout fly fisherman. ·´¯`·...¸><)))º>