Flow is also extremely important. I put the cut minis in a slotted soap dish that attaches with suction cups and point a koralia at them. They slime a lot, the slime attracts bacteria that if left to build up, will cause an infection and they'll dissolve. After cutting, let them sit in a container of tank water for about 10 minutes. They will stop slimming at this point can put them back in your tank. Only cut in half, they heal much faster and never had losses. It is nerve wracking to cut expensive ones so start with a plainer one and see how it goes.