I did a 2 gallon water change on my Aqueon Evo 8 this evening. About 5 mins ago Iooked in w/ a little key ring light and quickly turned the aquarium light on and took of picture of it doing this. It's fully extended during the day past the plug, gets smaller in the evening- but THIS i've never seen. Is it happy or pissed? I know there's always stuff floating around after a water change. For some reason maybe it was too much of a change for it today? kept all the same. These were extending like an inch out at first. Otherwise during the day looks like your basic full red mushroom.