I have a IM Lagoon 25. I'm thinking to go this route as well for redundancy. I had considered a single return like a Eheim compacton 1000 or even a Jebao DC 2000, but I think I will also go with two smaller AC pumps. I just need the redundancy since I travel a lot. I want something quiet though. Ive heard conflicting opinions on the Sicce. Seems quite hit and miss with it being quiet or noisy. I read on the IM FB group that since they switched to China made they are not as good as before. I think I may go with 2 Eheim compacton 600 or two Tunze 1073.008's.