hi i need help with my kribensis i have them in a 29 gallon tank hey have a lot of caves , the temp is at 78 degrees normal for all fishtanks to be at that temp where i live , but the point is i've had them 1 year ago 4 kribs are in the same tank 1 female and 3 males two of the males are always at one corner because the other have paired and t\dont let them near the caves but still the ones that are paired dont want to spawn although they always are colored but no spawning wat can i do?