Fronts are hard to sex until they are a little larger, and the only way to be 100% certain of sex is by venting them. Your best bet is to find a deal on 7-8 of them. Keep the females and 2 males (the alpha will establish himself and when he does you'll know) Fronts are harem breeders and do not "pair" up, the alpha will get busy with all the females.
For substrate I prefer sand, black sand. The fronts love it, they love digging and sifting through it.
How much bio capacity does that sump have? It should do the trick, look for a pump that will turn your tank over 4-6 times per hour, so around 550gph, figure after head loss you're looking at around a 700gph pump.
Since you're going with a RR tank, I would ditch the idea of the HOB filter, if anything get a larger wet/dry, that way the tank can sit flush against the wall and you won't see the intake from the HOB.
For substrate I prefer sand, black sand. The fronts love it, they love digging and sifting through it.
How much bio capacity does that sump have? It should do the trick, look for a pump that will turn your tank over 4-6 times per hour, so around 550gph, figure after head loss you're looking at around a 700gph pump.
Since you're going with a RR tank, I would ditch the idea of the HOB filter, if anything get a larger wet/dry, that way the tank can sit flush against the wall and you won't see the intake from the HOB.
