Nope. Never cleaned a thing, although they set up shop and had babies despite crossing the species boundary (I had one yellow and one blue.)
Eventually the female died of old age and shortly thereafter the male, also at a doddering old age, somehow made it down the overflow (filled with bioballs), over the wallfall into the next chamber, past the skimmer pump intake and through a 4" wide chamber/air bubble trapped packed with rubble in which there were only two 2" holes for the water to flow through. I found him in the return compartment with a broken back; still alive and not sucked into either pump. He died very soon after that.
And STILL never cleaned one thing.