Updates: Atlantis Project

what's the bowl made of? you idea of drilling holes near the bottom to bleed of enough air to compensate for the burp sounds as if it would work the best. you'd have to experiment on how many holes would be required. if you don't want multiple holes you could attach a low level pump's intake as a forced exhaust like P457 suggested. not sure how you'd pull that off though. first you just silicone an airline interconnect piece into the holes, attach some airline, and you'd have a snorkel. connecting that to an intake would be somewhat difficult (not that i've ever tried it). you might want to take a look at a small power head, they usually come with converters for smaller undergravel filters (my aqua clear ph201 did). be very cool if you get your contraption to work, good luck.
 
If you could get an airpump to suck the air out of it you could just leave a hose as the air inlet. As the air gets sucked out it would naturally replace itself. Its an idea with legs. What was the original logic behind the vent? Were we just trying to avoid the unfortunate siphon type incident? Why didn't anyone think of this the last time around?

I don't think you need an airstone, just an airline, especially with this suck the air out option. I don't think the placement is all that critical.

I can't really visualize the entrance or the beach.

I still like my other bowl with some driftwood maybe for the ramp. (I'm going to stop lobbying for it now).

Nay not said. No nay near.
 
Thank you for all the feedback and no naysaying. My apologies for not responding sooner, I slept over at a friend's yesterday.

The tube that sucks air out of the globe, I am having a lot of trouble grasping this. They sell air pumps that suck not just blow? (pardon my french) I was not aware.

I agree I don't need an actual air stone at the top of the tube dunno why I did that.

I think I forgot to mention, I did manage to get some of the burps to go through the trial pvc pipe tunnel entrance, and it looked very cool.

Another effect I would like to mention, when the air pump is not in use the water level inside the globe can rise to the land level so its quite marshish. When the air pump turns on the air pressure forces the water down until it reaches a level as to let air slip out under the globe lip.

My girlfriend's dad is going to be teaching me how to do mosaics soon and I am considering doing one as a backdrop for my aquariums. My first one is going to look like a black mage from the final fantasy game I hope.

Thanks again for all the help, I will make another post as soon as I accomplish something more. My gf's dad also got a digital camera for christmas so I plan on taking pictures of the finished product if it doesn't look just horrible.
 
What I did was I took an aquarium bowl, wove tubing around the rim, and put some tubing pieces in the weave with suction cups on the ends. Then I siliconed the weave to the rim and the cups to tiles. Sand on top of the tiles was enough to keep the globe down.
Click to expand...

Why does the rim of the bowl need to be beneat the sand? if you extended the bits of tubing that connect to the suction cups enough, you could suspend (that's the wrong word... what's the opposite of suspend???) the entire bowl, rim and all, about one inch above the sand. If you tip the rim slightly, this might allow the air to bubble out at a rate equal to it's bubbling in, as well as eliminating the need to build entry tunnels. All you would need to do is build a little mountain inside so the crabs could climb above the waterline.
 
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