So at 4 am this morning, my filter starts making this huge whirring noise out of nowhere and wakes me up. I get up to check it out and as I'm looking into my tank, I notice something is flashing inside of it. I thought my eyes were playing a trick on me....but I'm certain that they weren't. It flashed about five times before it stopped and disappeared. Thinking back, it reminded me of how a lightning bug flashes. ANY IDEAS?! I have no clue as to what it could be...I've never heard of things flashing...and I'm at a loss! But I have to know! Lol