Today I noticed that I have approx 30 eggs stuck to the side of the tank and the male is guarding them well. Two of the eggs have been destroyed in the last hour and I believe that the male Bn did this. I am concerned that my filter has packed up because the current seems slower than usual and I have an oily film on the surface of the water. I want to do a water change, but the eggs are quite high on the tank side and I don't want to disturb them. Any advise?