Guppies: Friend or Foe? An Honest Take

Guppies are the fish everyone tells you to start with. Cheap, colourful, hardy, sold in every shop — the perfect beginner fish, supposedly. I have kept them twice now, years apart, and my honest answer to "are guppies a good fish?" is: it depends what you put them with. On their own they are a joy. In a mixed community, mine turned into something closer to a problem. This is the real account, not the brochure version.

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The short versionGuppies are genuinely great fish — active, colourful, endlessly busy. But after two rounds of keeping them, I now believe they are best kept in a species-only tank. In a community, their constant activity and breeding pressure caused more trouble than I expected.

My first guppies: learning the hobby

Guppies were among the very first fish I ever kept, back when I was still learning what an aquarium even was — how cycling worked, how an ecosystem balanced itself, what fish actually needed. And for that, they were perfect. I had longfin guppies (not the dumbo-ear type, just the flowing longfins), and they were all over the tank, every level, constantly searching for something to eat or just something to investigate. Colourful, curious, always moving. As a first fish that teaches you to watch and learn, a guppy is hard to beat.

They never bred much for me that first time, though. I would see fry, but they never seemed to make it to adulthood. Looking back, the reasons are obvious: the tank was too small for them, and I had no plants. Fry need cover to survive — somewhere to hide from the adults in those first vulnerable weeks — and a bare tank gives them nowhere to go. If you want guppy fry to live, that is lesson one, and I learned it the slow way. The right plants, especially floating ones, change everything for fry survival.

My second attempt: a stocked community, and where it turned

Years later, guppies were in demand at my local fish store, so I gave them another go — this time properly, in a bigger tank, planted both with rooted and floating plants, alongside a real community: a mix of snails (bladder, Malaysian trumpet, ramshorn and mystery snails), three bristlenose plecos, and six white cloud minnows.

At first it was exactly what you would hope for. Peaceful, planted, balanced. The guppies thrived — this time I had fry everywhere. But the cracks showed as the tank matured, and they were not the cracks the guides warn you about.

The harassment problem

My two main female guppies were relentlessly harassed by the males. This is the part the "perfect community fish" articles gloss over: male guppies do not let up. The pressure on those two females was constant, and it got to the point where the males effectively killed one of my mother guppies. Not through aggression in the predator sense — just through unrelenting breeding harassment that wore her down completely.

What they did to my mystery snails

This was the part that genuinely surprised me. The guppies started pestering my mystery snails — biting at the shell, pushing it, even going for the antennae. I would constantly find a mystery snail pulled into its shell, hiding, while two or three guppies pecked at the exposed foot and lower body. One of my mystery snails died from exactly this: pecked at the foot until it could not recover. I had never read a single warning that guppies would do this, but in my tank they absolutely did.

They never bothered the bristlenose plecos — though honestly, I got the sense they wanted to and just thought better of it. The BNS were too big and armoured to be worth it.

From the fishroom

The snail deaths are what changed my mind about guppies in a community. A fish sold as a gentle, peaceful beginner species was systematically harassing my mystery snails to death — ganging up, targeting the soft foot, waiting them out. It is not in any care sheet I had read. It is exactly the kind of thing you only learn by watching your own tank closely, day after day.

The plants

My plants also took a hit — at least the ones soft enough to be worth eating. The guppies grazed those down. But my Hygrophila sp. survived the whole ordeal and is, in fact, still growing in my tanks to this day. If you keep guppies in a planted tank, lean on hardier, faster-growing stems that can outpace the grazing rather than delicate species that will simply vanish.

So, friend or foe?

Both, honestly — and which one depends entirely on how you keep them. I am not a true guppy fan after all this, but I will not pretend they are bad fish, because they are not. Here is my honest verdict:

As a first fish to learn the hobby with — friend. Active, colourful, forgiving, and they teach you to observe.
In a mixed community with snails and gentle tankmates — closer to foe, at least in my experience. The harassment of females and the pestering of my mystery snails was real and it cost me animals.
If you love guppies and want them to flourish — my honest advice is a species-only tank. Give them their own space, plenty of plants for the females to escape and the fry to survive, and you get all the colour and activity without the collateral damage.

It depends on your goals. If you want a busy, colourful, breeding livebearer display, guppies in a species tank are wonderful. If you want a peaceful mixed community with inverts, I would think twice — or at least watch your snails closely.

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If you keep guppiesGive them plants (floating plants especially), keep two to three females per male to spread out the harassment, and if you value your snails or shrimp, seriously consider keeping the guppies on their own. A species-only guppy tank is where they shine without causing trouble.

If guppies are dying on you rather than thriving, that is usually a different problem — water quality, cycling or stocking rather than temperament. Start with cycling your tank and the water parameters guide. And if you are weighing guppies against their smaller cousin, I kept those too — see guppies vs endlers.

Frequently Asked Questions

Are guppies good community fish?

It depends on the community. In my experience they are fine with robust, similarly-sized fish, but male guppies relentlessly harass females, and mine pestered and even killed mystery snails by pecking at the foot. If you keep snails, shrimp or gentle tankmates, watch closely — or keep guppies in a species-only tank.

Do guppies bother snails?

Mine did, badly. Two or three guppies would gang up on a mystery snail, biting the shell and pecking the exposed foot and antennae until the snail hid permanently, and one died from it. Not every guppy does this, but it is more common than care sheets admit. Small pest snails like Malaysian trumpet snails were left alone; the large, soft mystery snails were the targets.

Why won't my guppies breed, or why don't the fry survive?

Usually a too-small tank and no plants. Guppies breed readily, but the adults eat the fry, so without dense planting — especially floating plants — the fry have nowhere to hide and rarely reach adulthood. My first guppies barely bred for exactly this reason; my second, heavily planted tank had fry everywhere.

How many female guppies per male?

Two to three females per male. With fewer, the males concentrate their constant breeding harassment on one or two females and can wear them down — in my tank the males effectively harassed a female to death. More females spread the pressure out.

Should guppies be kept alone?

Not strictly — but after keeping them twice, my honest recommendation for a trouble-free tank is a species-only guppy setup. You get all their colour, activity and breeding without the harassment of tankmates or the risk to snails and shrimp. It depends on your goals, but species-only is where mine caused the least trouble and looked their best.