rohape

Oh wow, your tank looks great!
Congrats on the babies, that is too cool. I wonder if the fry aren't munching on the algae on the hornwort.
Have you checked your tank at night? MTS mainly come out at night.
There are few snails that actually eat algae. Fish too, and its usually either a specific kind of algae or just not enough to notice.
One snail that eats strictly algae, mainly the dust algae, like what grows on the glass is the Nerite. I have 9 in my 55gal and the glass and rocks are always clean. If you get any you should only need 1, 2 at the most for your size tank.
ombcat sells Olive Nerites, which is who I got mine from and they're still kickin'.
Again, that is one good lookin tank.

Alex123

Thanks rohape for your kind words, it gives me more motivation to learn and make it better the next time around. Which by the way is not too far off. I just purchased a 20 gallon off of craigslist. I wanted a long 20 gallon but it was a tall 20 gallon. Not the exact aquarium I wanted but it definitely will also be el natural. I will do that one in the near future. It has everything stand,filter, etc. So looking forward to a new build. Since it's tall, I could cosider taller plants as well. Olive Nerites sounds like an awesome snail to have as well. I will keep an eye out for it next time I visit my local pet shop.

rohape

Look for something that looks like sesame seeds on the shells of the mystery snails. That's a definite sign of nerites. Take tonight for example, we stopped by our LFS just to look around. They had tons of Mystery's and I noticed the eggs. My search turned up 2 olive nerites which the employees had no idea what they were so I got away with 2 "pest snails".
I already have 9, so if your interested I could send them to you. They're still pretty small, only about dime size.
Or just get lucky like I did. If you consider buying my 2, you'll have the weekend to hit the LFS's and try your luck.

Congrats on your find on CL. I hate CL, it's so evil cause my wife has limited me to my 1 55gal.