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Does anyone know what kind of eggs are these? I was cleaning the tank yesterday and decided to spread out my small patch of micro swords (I had it all clumped together from the pot but broke them up and spread them out in 1/2" increments hoping to aid in it spreading) Well when I was done I noticed two small group of "bubbles" floating around, one landed on the substrate and a Cory snatched it up, the other free floated for a few minutes before a danio decided to munch on it. After getting done I noticed one remaining batch stuck to a stem of the Micro Sword (sorry for the low quality pictures, took them with my cell phone)
That's what I was thinking also. I recently got a few hitch hiker snails with my crypt. Three of them look like standard pond snails the other has an orangish shell with black spots. Sorry no pictures of them. The most I've seen at one time is 4. I was hoping it was the eggs were from the Rasbora's but I've not noticed any spawning behavior (then again I was gone all week so wasn't sure) Either way it's a moot point, between the photo last night and about an hour ago something had eaten them. Pretty sure a Cory snatched them up lol. Probably for the best if they were snail eggs, I like having a few snails but don't want to get over run by them.
Awesome, here comes the Ramshorn/Pond Snail infestation. lol. The other ones are a bland dark grayish color and the shells kind of come to a swirly point. The Ramshorn is by far the largest, the other three are still too small to get a decent picture. Does that sound like your basic garden variety pond snail?
Its kinda hard to tell with out a picture but here's what I know from having pond, ramshorn, and MTS (Malaysian trumpet snails). Pond snails have a smooth shell that looks like a cap or a turtles shell just smooth. Ramshorn snails come in different colors but they get their name from their shell looking like a rams horn. Pretty distinct shell on how it spirals in on itself. They also get big. Now a MTS has a cone shape shell that spirals to a point.
The only snail I ever got rid of was the ramshorn because it may or may not eat healthy plants. Some say they do some say they don't. I didn't want to find out. LoL I am not really sure what actually happens to it though just went MIA and I never went looking for it. Now the other 2 are really beneficial to your tank. They wont eat live plants. If you see them on the plants they are either eating algae on them or dying plant matter. MTSs will burrow into the substrate. Which will help aerate it and break down matter easier for the beneficial bacteria to break down. If those are the snails you have I wouldn't worry about them. They will not over populate your tank if you don't over feed your fish. They will only reproduce if food is plentiful.
I just did some googling and read your post. I'm leaning towards them being pond snails. The multi colored shell one is smooth like a turtle shell or 'cap' The other ones I rarely see, but from what I remember they have a pointed shell. None of them look like the Ramshorn photo's I've seen. So I may of lucked out. The what I'm now dubbing as the 'pond snail' is the largest of the bunch, the others I saw yesterday (spiral pointed shells) were on the drift wood, but I just spent 15 minutes trying to find them and I couldn't find any of them, even the pond snail. I guess until they are eating plants or literally taking over the tank I'm not going to worry about it. Nature (a natural tank) sure is fun :)
The spiral ones I am beating are MTSs and hiding in the substrate. When the lights go off wait a couple of hours then turn them back on or use a flashlight and look around and I beat you will see them. Most of the time I hardly ever see them with the lights on with exception of a few. You can also wait till the next day and look when the lights first come on. If you really want "catch" them just to see what they are put a algae waffer in the tank with lights off and wait a little bit. They are attractive to them like white on rice! lol that works with the pond snails as well. I will occasionally throw on in there for them and the whole disc will be covered up with snails! LoL