I've tried a few different types of caves or logs and I have found that my bristlenose that aren't fully grown, (but are still mature enough to spawn) prefer these stone caves. I don't think a fully grown pleco would fit inside and I'm surprised that mine at their sizes still fit in there. There is a lip around the opening and I haven't seen any eggs get accidentally kicked out. I have four males and three of them fight over these stones. I have more than enough, but they still have to squabble over them. I think it might be time to separate them.
This video shows two of them fighting over a cave. The invader gets a cave in the end.
[flash=425,350]http://www.youtube.com/v/XHnziykE1T0" allowscriptaccess="always" allowfullscreen="true[/flash]
This video shows two of them fighting over a cave. The invader gets a cave in the end.
[flash=425,350]http://www.youtube.com/v/XHnziykE1T0" allowscriptaccess="always" allowfullscreen="true[/flash]