Everything!What's wrong with orange, green and purple?
I changed my tank from blue to brown gravel. I’m always finding some blue grains every now and then.Everything!
My wife...who, after 35 years of marriage, should know better...didn't want to hurt my granddaughter's feelings, and so allowed her to scatter the contents of a little 2 pound bag of fluorescent pink-and-chartreuse gravel into my 360 tank, which contained about 10 eartheater-type cichlids. By the time I got home that day, the cichlids had been doing their thing, and that little handful of glo-snot was thoroughly mixed and distributed. I have been picking it out...grain by individual grain...with forceps ever since then...over a year now. Whenever I think I have gotten the last piece...another one looms into view, usually being spit out by a Gymnogeophagus.
Gotta start locking that basement door...