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The 220 seems like a pretty good deal....and yes, a simple plug can be used to block off the closed loop bulkheads. You'll just need to provide flow by powerheads/gyre.
This guy is killing me. I wake up this morning to find that he has now excavated the sand from around the the cave opening, actually exposing the pipe. He moved a bunch of the sand into a pile that is being picked up by the MP40.
I would have guessed it was set up as closed loop at some point. I'd try to avoid check valves....there are ways around them. They will eventually fail.
He came out!
Sorry for the poor quality...under moonlights, slow shutter speed and hand held. He took about 8 to 10 mouth fulls of sand and then darted back into his home. I'm happy! :D
Phil, I think (and that's a BIG think) it has a standard behemoth overflow (I think I see it). I've got to believe those "extra" bulkheads we see are for a closed loop....but that's a guess as well. If it was me....a cheap SOB....I'd offer 1000 and see what happens. I actually think that...
Just to give you the heads up, MRC's are disgustingly noisy and need very large volume pumps. If you have a remote fish room, the noise shouldn't be an issue. I have both and MRC 1 and MRC 2.....best skimmers I've owned as far as pulling the gook. As far as price, I can't help short of...
WooHoo! I walked into the fish room and the little guy darted into the cave. :dance:
I stood there for about 15 minutes wanting a picture, but he didn't come back out. When I get a pic I'll post.
I also filled in his excavation of the Frogspawn from this morning.....lets see if he...
Thanks @kschweer and @njtiger24 aquariums .
I was afraid this would happen. The little bugger hasn't found the cave...or doesn't like it. Instead he has again undermined the Frogspawn....down about 1 1/2 inches....boy these guys are industrious! Not sure what I can do to make him move...
Guys, thanks for the responses.....and Marcus, I didn't do the barnacle one...that was someone else. I did the rock one in post #6....but thanks for the offer.