Cleaner Snail For Betta Tank

So, after moving my betta into a new tank a couple of weeks back, I've recently seen the place explode with algae. It's on the sand, the glass, the decor... it'd probably be on the betta too, if he didn't move around as much as he does!

In my main tank, I have about 8 amano shrimp that keep the place spotlessly clean, but I can't put them into the betta's tank, as there just aren't any hiding places for them. I never saw any trouble when my betta was in the main tank, but it was much larger, and had a lot more hiding places, but in the smaller, more enclosed tank, I don't think it's an option. The tanks too small for cories or otos, and way too small for any sort of plec, leaving me with one option for "natural" algae cleaning.

A snail.

Now, I've mentioned several times on here before that I do not like snails. I don't find them "cute", like some people do, I actually find them to be quite repulsive, but I'm willing to consider one if it'll do the job I need it to do.

My tank's a 25l measuring 40x20x20, with black sand, some moss balls, a cave and a few silk plants.

As I don't like snails, this isn't something I've ever looked into before, so I throw it open to those of you that know your snails and ask for options. I'm looking for just one snail, preferably a small one (since the tank's small too) and, most importantly, one that isn't going to leave a load of eggs/babies all over the place.

So what are my options?

Totally agree with Sue about nerite snails. In terms of what they look like, they are absolutely nothing like slugs or the slightly creepy sorts of snails with the big tentacles that move along pavements after a bout of rain. Viewed from above or the side (as opposed to on the glass), they almost look like a beautiful stone that is capable of moving in all sorts of directions but everything is largely hidden under the shell. Viewed from underneath if they're crawling up the glass, it's actually really interesting watching their behaviour as they're hard at work. I wasn't particularly enamoured with the idea at the beginning, but, having spent the best part of the last week fascinated by their antics now that I have 3 of them, I'm considering starting a "nerite snail appreciation thread"!

Should be fine... I've had them in an open topped tank (with a decent air gap) and they have been fine...

I will admit I've never actually fed my snails. When I used a slice of courgette for the shrimps they ignored it. I have 2 nerites bought in 2011 which are still alive, so they must be feeding on something. Probably all the algae I used to have.

I currently have a zebra nerite and a red with black markings bought in 2011, a yellow and black striped one bough in 2013 and a grey one shaped a bit like black helmet nerites which I bought in 2014. The second red and black, and the brown zigzag pattern, both bought in 2014, have died this year.