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Ahh .. they changed the basket colors from black to white and added smaller red baskets that go into the bigger white ones as wellI think the first version of the FX6 had maintenance dials on the lid. The only purpose they served was to remind you of the date you last cleaned the filter - which seems like gimmicky nonsense to me.
The next version did away with the dials and just has a bracket for holding the water change hosepipe.
When I had it hooked up to a 100 gallon malawi tank, I didn't bother with the water change feature. It was easier just to vacuum the gravel with a siphon and pour buckets of water in the top.Do yall use the water change feature?