Clear slime on surface of sump water

[Clark]

Is this normal? My sump is diy so I'm wondering if I missed a part. My skimmer is in the sump too and pulls out scum pretty well but it's intake is too low to pull in the slime from the surface

Thanks!

[Dan H]

Many times you will see surface scum in sumps. This is because the overflow in the display tank pulls out the surface scum then drops it in to the sump. That plus all the aeration creates more surface area for adhesion. I usually see a little scum in my sump if we don't run a small pump to agitate the surface, or if it's been a while since the last water change.

You can manually remove the slime by skimming the surface with a bowl or container.

[Clark]

Thanks Dan!

[Sascha D.]

post a picture of your diy sump. What is the baffle design and spacing?

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[mbaxter]

Do you use kalkwasser in an ATO? Ive had that happen dosing kalk in a low flow area above the water line. placing the ATO effluent in a high flow area might do the trick, if that fits your scenario.

[Clark]

Thanks, I don't use Kalk.

My diy design is simply a large plastic tub with a few small bins stacked inside one another to house filter floss and purigen between them as a trickle filter. Holes at the bottom of the stack allow the water to escape into the sump. It's as Dan says about the scum coming down from the weir in the DT.

But it made me wonder if there was some kind of adsorbing material or aeration system people may have used to trap the surface scum. I'm able to collect it with shallow cup easily enough.

Thanks!

[Sascha D.]

Np, it sounds like you've gotten your question answered as far as you want to pursue it. Good luck with the tank!