I had a pair of angels spawn in a community tank, tank has lotsa wood and live plants. In an effort to raise some of the eggs I set up a 29g tank with just a heater, slate and sponge filter in it and moved the pair into it. It has been almost a month and nothing. The filter was "aged" and the water peramiters mirror the original tank. Is there a step I missed or something else they need to spawn again?