it would be difficult and very stressful for them to catch them outta their 1100g home.the w/c pair are a GOOD 18" AND THICK AS H-LL.i'm afraid they would screw up the "colony " of 1 male and 4f breeding if i added them.i am going to remove the azul and relocate the kelberi to their own tank and leave just the 2m4f x's.
