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I think I'll use the first technique, seems easier and more reliable for a newbie like me. :D

Hmm. How can I tell the difference?
I haven't done anything particular to get them into "spawning mood".

My cichlids are pushing the gravel off my undergravel filter plate, and are building little piles. Is it okay if a "tidy up" after them and put the gravel back, or will this annoy them?