Ahahaha. I had the same problem with my labs. They do breed very easily, and can quickly overtake a tank.
I suggest either venting them and getting rid of the females, sell a certain amount every few months, or get rid of them all together - which is what I did.
Otherwise, the tank is awesome! I actually really appreciate you posting it, because I was contemplating what the mix of holey rock and lava rock would look like. I like it! Did you get you lava rock from any specific place?
Very nice mix, minus so many yellows. I love the shot of the two peacocks - what kind are they each?