Some are good, others not. I've got two. One never has trouble starting, the other does. When it doesn't start you have to turn it on & off repeatedly until it goes. Other then that they work fine. For the price difference I'd get a Tunze Nanostream 6025 (which I did). They're much nicer on the eyes, little bit more flow, easily directed, smaller footprint and better made IMO.
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225g reef 3x250w MH 8x39w T5 Sfiligoi/ACLS, Deltec AP851, Deltec PF601S, Deltec KM500, Ozotech Poseidon, Aquatronica, Tunze TS48, Tunze Nanostream 6025s, Aqua UV 114w, MTC Ozone reactor, Cole Parmer peristaltic pump
67g reef, Euro-Reef RS135, 60g refugium, Mag 9 return, Tunze Nanostream 6025s, 4x39w T5
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