Sump Sponge - Does it need to be fully submerged?

[omniphil]

The most likely Avenue for flooding is that pf-800. I run the same on my 30g and the u-pipe developed a crack which loss the vacuum so it was no longer draining. Most ATOs have an automatic stop if it runs too long to prevent flooding in this case.

Manual topoff (at least for me) caused more splashing and drips than the ATO

Did the PF-800 overflow or your tank?

 

[silent1mezzo]

Did the PF-800 overflow or your tank?

The tank came close, the ATO shut itself off automatically and then the return pump just ran dry for a while until I noticed