I believe those are pond snails or at least they are the same ones I have. Yup they swing their shells and ride one each others shells. But I believe while they are riding they are not mating but rather attaching eggs to the others shell.

Pond snails are prolific breeders as they breed a sexualy.

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100G->African Cichlids:Kribensis-2,Bumblebee-2,Red Zebra-2,Elec. Yel. Labi.-2, Acei-2, Elec. Blu. Johanni-2,Peacocks-2 / Community: Australian Rainbow-3,Turquoise Rainbow-4,Dalmatian Mollies-2,white molly-1,Dojo Loaches-1/Cleaners:Chinese Algea Eaters-5/Murderers: Dinosaur Bichir-1And lots of other tanks,2-Gourims,6-Rams,1-Arrowanna,6-FW Flounder,1-Farlowella CF, 1-Spiney Eel

The reason I assume they are bladder snails is that their shell curls to the left rather than the right. from what I've read this appears to be the distinction between the two. The bladder snail also doesn't grow as large. They have translucent shells will a little sack of air inside. I sometimes see them free floating around in the current from my filter. heh.

They are prolific indeed, in two weeks they have gone from one or two 1/4" specimens to at least 15-20. I can see little egg sacks all over my wisteria plants. I plan on removing a good number of them and feeding them to my convict if they begin overrunning the tank.

My little 10G that they started out in was actually very neat to look at with all the snails. They do seem to free float or rather "ride" to a new place, but the shell wagging cracks me up.

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100G->African Cichlids:Kribensis-2,Bumblebee-2,Red Zebra-2,Elec. Yel. Labi.-2, Acei-2, Elec. Blu. Johanni-2,Peacocks-2 / Community: Australian Rainbow-3,Turquoise Rainbow-4,Dalmatian Mollies-2,white molly-1,Dojo Loaches-1/Cleaners:Chinese Algea Eaters-5/Murderers: Dinosaur Bichir-1And lots of other tanks,2-Gourims,6-Rams,1-Arrowanna,6-FW Flounder,1-Farlowella CF, 1-Spiney Eel

Wait, I thought pond snails were asexual breeders, so they can explode in population even if you start off with one unpregnant female..... now I'm confused, lol.

And, at first I was like, "Holy crap their snails are fast!" Then I was like, "Oooooh.... probably sped up the video, duh!" LOL!

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20g Heavily Planted http://www.aquariumforum.com/gallery...00&ppuser=8981
36g Bow Front Heavily Planted http://www.aquariumforum.com/gallery...00&ppuser=8981

Pretty sure these aren't pond snails, but bladder snails due to shell curling to the left (a very distinctive characteristic amongst snails). The video isn't sped up, bladder snails are really fast! They can make it from one end of the tank to another in a matter of seconds. Even faster if they skim along the water's surface. They can also breed asexually, though I often notice snails riding each other around, inserting part of uh... themselves into the shell of the bottom snail.

Crazy! (Lol, now I really feel dumb!) Cool videos though!

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20g Heavily Planted http://www.aquariumforum.com/gallery...00&ppuser=8981
36g Bow Front Heavily Planted http://www.aquariumforum.com/gallery...00&ppuser=8981

I'll pay you if you'd ship me some! Dead serious - my tanks need a good cleaning crew.

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Officially fishless until after the move....tune in later for details!

I got a Cabomba bunch at my LFS and there was some snail eggs attached to them. There is probably atleast 10 snails right now. Roughly 4 black ones like in your videos, 4 white ones and 2 that look like black ram snails.

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50 Bowfront, 2 Acei, 2 Yellow Labs, 1 Orange, 1 Albino, 2 Blue African Cichlids
30 Gal, 3 Fantail Goldfish, 1 Black Ryukin, 1 Common Pleco
20 Gal, Mollies, Platies, Cories, Algae Eaters
15 Gal, Swordtails, Balloon Mollies, Rasboras
10 Gal, 2 Knight Gobies
10 Gal, 2 Bolivian Rams
1.5 Gal, Male Betta

Ha. My advice is to pick up just about any plant from your LFS. The tank is bound to be teeming with these snails. If you see any I'm sure they will throw them in the bag for free, they don't have much monetary value. I had maybe 3 or 4 in the tank originally... within two weeks that number ballooned to 20-30 at least. Probably many more that weren't large enough to notice. I have to remove a large bunch at least once a week to keep them under control..