that probably petroleum jelly used to keep the rubber part live longer. It should be safe, infact I always apply ptroleum jelly to my filter during maintenance.
Thanks bros,
Btw can i like let my filter cycle once with warm water? will it like damage anything?
The petroleum jelly won't affect the fauna? In fact i just bought a new atman HOF and i discovered there's oil in it, i rinsed thoroughly with water and thought that it's safe for my guppy fries. Sadly, it killed all but 6 of my fries after running for 2-3 days with that filter. I scooped the remaining 6 out into another clean container with treated water and the 6 revert back to normal again...so do clean properly and don't think the lubricant/petroleum jelly is always safe for your fauna.
Out of anger, I clean the whole filter with soap to remove the oil slick and soak them in water for a few days to make sure it's safe...![]()
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