The sword was my pleco's idea right after he pulled it they spawned on it . It seems to be pinned in the corner with a nice gentle flow so I left it be - didn't want to disturb anything (water level was down - plants pulled up and I was afraid to top it up , replant till I could see how they are ) . They seem to have caring for the eggs down . When/if they get to wigglers I hope to have then in another tank. I was told when I bought them that they had spawned in the tank at the LFS but I had them for 3 months before they spawned again , and I wonder if a change to another tank would stop them from spawning . If I did put the in a new tank would a 25 or 20 tall be OK?