While cleaning the 240 today I noticed what looks like scratches. But they aren't, you can't feel them. They are inside the acrylic. It looks like something fell down the side of the tank and it skipped down the side creating scratches but yet, its inside. There is a 240 at the LFS for $500 that has some of these, a lot bigger than what I have. I may get it and use it as a sump for the 300 if its still available.
Anyone know the name for this or what causes it?
Anyone know the name for this or what causes it?
