In case you're ever wondering what can quickly eradicate diatoms...amano shrimp! A few months ago, diatoms started showing up throughout my 36g tank. I was a bit surprised because my tank isn't really new any more, it's been running since July of last year. It got so bad that every plant, leaf, rock, and piece of decor was covered in that nasty brown stuff. I tried wiping it off with my fingers but that just got tedious. My guess is that overfeeding was the main reason. I tested for phosphates and while I can't remember what the exact result was, I do remember that it was pretty low. So I cut down the amount and frequency of feedings but I still needed to get rid of the diatoms. After reading on several threads here that amano shrimp are good diatom eaters, I decided to get some. About 3 weeks ago, I put 10 amanos into my tank. Here is a picture of my tank probably just a couple days after I got the shrimp. Gross, right? Then in less than 2 weeks, probably about 10 days, the diatoms were GONE! This picture is from tonight, but the tank has been this clean for over a week. Huge difference. You can see some of the amanos in the foreground. So proud of those kids. They must've done most of their work overnight in the dark because I rarely saw them out and about during the day. And every morning, my tank was just a bit cleaner than the day before. Oddly, I see them out and about more often now (as you see in the picture), when there are no more diatoms. I've been feeding them a mix of algae wafers, shrimp pellets, and zucchini/summer squash.