I have a lot of algae that is just on the glass in my 15gal tall RCS tank.
I tried growing out some BNP fry in there to fix this problem, but after a few months I think it may be worse, not better, and the fry got large enough I had to move all but one back to a bigger tank.
So I decided to try something else. I ordered a couple Nerites.
This is about 24 hours after putting them in the tank. This one small snail has cleared the entire corner.
(Unfortunately, his larger friend decided to clear the back glass under the HOB filter first... )
I think I may have solved this algae problem.
Here's a shrimp picture just for fun. I selectively bred this tank for a brighter more solid red color and they're doing very well. As you can see, even the small juveniles show very nice color.
They continue their slow but steady progress. It amazes me that they stay in the same general area, I would have thought they'd just pick random directions and eat as they went. The big one has about 2/3 of the area under the HOB cleared, and the small one is now going up and down the same corner he was going back and forth across before.
By my very rough estimate, the dime sized one clears about 3 square inches a day, and the quarter sized one about 4 square inches. At that rate, they should have all of the 420 square inches of glass cleared within about 2 months. So the question becomes, how fast will the algae grow back over the cleared glass. I worry that I may actually end up at near to a stalemate. Anyone else find they need more than 2 nerites to keep the glass clear on a 15gal tank?
Oh sure, I know that I could cut back on lighting or make other adjustments, but this is the best breeder of my 3 shrimp tanks and I'm not messing with anything that might slow them down. I don't NEED to see in the tank all that well (but it would be nice, lol).
I just hope they aren't like dogs and eat themselves to death haha.
The smaller Tiger Nerite has died. It's been upside down on the substrate now for more than a day, and I can no longer see any meat in the shell.
The larger one is still eating away, at the back glass, of course.
Any thoughts on what caused this? Do I need to be worried now about something killing all the shrimp in the tank?
EDIT: I have these critters in the tank, but they've always been in there and haven't seemed to hurt the RCS at all. They did NOT come in with the Nerites. What are these tiny worm-like things? They seem to possibly be eating the dead snail.
And a Top view of the tank just for fun. You can see where the small (now dead) Tiger Nerite was eating along the silicone in the top left of the shot, and the bigger one was eating under the HOB filter.
Unfortunately I don't have an answer for you, it was in my guppy hybrid tank a long time ago. Possibly came in on a plant? I gave the tank away as is because I kind of hate leeches. Maybe some other people can chime in.