The one time he is completely dark brown (with little light spots) and the other time, he is brown with lots of light marks on his body..
How can this happen? Has this something to do with hiding and camouflage or what is it?
Here is a picture with 2 pictures of my ancistrus in it, one without marks and one with marks.. perhaps you could tell me what it is?
![Image](http://img407.imageshack.us/img407/1073/zwoeliemarks4ls.jpg)