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Where did you get that drain cover?Should work fine, just make sure to clean it during water changes. With your first picture I thought it was metal, but second picture solved thatWhere did you get that drain cover?
That doesn't look like it would work well for surface skimming or maintaining your water level. I would slap one of these over it.
how would it not maintain water level? That’s what I was concerned about, but my LFS said it was fine
can I modify the overflow skimmer box and just caulk that to my tank? I still have it.
With an overflow box the water level maintained right at the top. It overflowed over the top and then goes through the bulk head. The level might change a few mm when you turn the pump up or down but it is un noticable.
With your setup there is no overflow to maintain the water level. the water has a lot less space to work with so the level is going to fluctuate a lot more if you have variations in flow or if the screen gets clogged with algae or even just a bit snail. And you won't be able to have it fully submerged because then you would have to matches the flow of your pump exactly with capacity of your gravity fed drain.
ok, modify my skimmer box it is. I’m just gonna make it so on my skimmer box there is no back (just enough to caulk down) and call it a day.
no one seems to answer this, but it doesn’t matter that the back box is gonna be level with the skimmer box?

