I love my Radions, ghost skimmer, and stock pump. I have had issues with each one of them, but it was partially my fault.
1) radions:choosing the specific settings for "my tank" not anyone else. I love how the unit looks, it's clean and sleek.
2) ghost skimmer: adjusting it just right. Mostly it was the installations. Reading IM GHOST skimmer manual really helped. I placed mine in the second chamber with the input of the skimmers pump facing the first chamber. Placing the skimmer as close as possible to the first chamber gives the skimmer room and prevents the microbubbles. I enjoy not looking at my skimmer, it is tucked in and disappears in the back chamber.
3) stock pump:it made noisy, reduced flow, rattled.... I took it out, cleaned it in a vinegar bath. Then I tightened up the output nozzle and tucked it underneath the third chamber, had the "y" as close to the fourth chamber. This gave me room for my heater, ATO, and the return lines.
Either option, I'm sure you'll enjoy your tank and experience growth!