Plecos for algae control — what to know first

Before we get to algae control, one thing worth knowing upfront: the 'common pleco' you see sold cheaply in pet shops grows to 18 inches or more. They're sold at 2–3 inches and look perfect for a community tank, but within a year or two they outgrow almost any home aquarium and cause real problems. The good news is there's a much better option. What size tank are you working with, and is it already cycled and running, or are you starting fresh?

Perfect — a 60 litre established tank with tetras is exactly the setup where a Bristlenose Pleco shines. They max out at around 4–5 inches, they're genuinely effective at grazing algae off the glass and décor, and they're peaceful enough to leave tetras completely alone. They're the most practical algae-eating pleco for any tank under about 200 litres. What kind of algae are you seeing — is it the brown dusty stuff or green patches on the glass?

That's exactly what Bristlenose plecos are built for — they rasp green algae off hard surfaces all day. One thing to add: they do need a piece of driftwood in the tank. They rasp on it, it aids their digestion, and without it they don't thrive long-term. If you don't already have driftwood, pick up a small piece when you get the fish. You'll also want to supplement with algae wafers a few times a week once they've cleared the glass, since you don't want them going hungry. I'd recommend Hikari Algae Wafers — they're widely trusted, the plecos go straight for them, and a tub lasts a long time in a small tank.

One is plenty for a 60 litre. They're mildly territorial with each other, so keeping a single Bristlenose is actually the better call in a smaller tank — you won't have any squabbling, and one fish will handle the algae load from a tank that size without any trouble. Just make sure your existing tetras aren't nippy breeds, since long-finned Bristlenose variants can get their fins nipped. Standard short-finned Bristlenose are more robust and easier to find anyway.

Neon tetras are ideal tankmates — no issues there at all. To summarise: one standard Bristlenose Pleco, a piece of driftwood if you don't have one, and Hikari Algae Wafers to supplement once the glass is clean. That setup will serve you well for years. Good luck with the tank!