at 4", im pretty sure they ca, but dont go by me to much, i know it is possible in flowerhorns, but never owned or researched RD's.
id say it would just be eaier to keep the pair then trying to introduce, but it wouldnt be imposible to introduce her to your big male, just make sure you use the divider method to introduce her if you choose that route.
id say it would just be eaier to keep the pair then trying to introduce, but it wouldnt be imposible to introduce her to your big male, just make sure you use the divider method to introduce her if you choose that route.