Change my mind: bettas are not community fish

[w0lfpack88]

I've been keeping bettas for about 8 years now, and I've lost count of how many times I've seen people shove a male betta into a 20 gallon community tank and then wonder why it's hiding or nipping fins. I get it. The pet store says 'community fish' on the label. But that's marketing, not reality.

My first betta, a veiltail named Sushi, lived in a 10 gallon with a school of neon tetras. For the first two weeks, everything looked fine. Then the tetras started nipping his fins. Not aggressively, just curious little nips. Sushi got stressed, stopped eating, and developed fin rot. I had to move him to his own 5 gallon. After that, he thrived for three more years.

Since then, I've tried bettas with corydoras, harlequin rasboras, and even a small school of chili rasboras. The only setup that worked long-term was a 20 long with a very docile plakat and a group of pygmy corys. And even then, I caught the betta flaring at them during feeding time. It wasn't worth the risk.

I know some people have success stories. I've seen the YouTube videos. But for every success, there are ten bettas sitting in the corner of a tank, stressed out of their minds. Bettas are solitary, territorial labyrinth fish. They don't need friends. They need space, warm water, and good food.

If you want a community tank, get gouramis. Honey gouramis are peaceful, dwarf gouramis are hit or miss, but at least they're not bettas. Or set up a betta sorority if you have a big enough tank and a backup plan.

So, am I wrong? Have you kept a betta in a community tank for more than a year without issues? What worked for you?

[BettaBoss]

Not wrong, but I think you're blaming the wrong variable. Neon tetras are nippy little shits by nature. A 10 gallon is 20 inches of linear swim space. That's not a betta problem, that's a tetra-in-a-tiny-tank problem. Put those same tetras in a 20 long with heavy planting and the fin nipping mostly evaporates, betta or no betta.

The other thing nobody mentions is order of introduction. Betta goes in last, after everyone else is established, and it's a completely different fish than the one that gets dropped into a tank of residents that already own the place. My best long run was a female in a 20 long with ember tetras and a pile of driftwood, went almost three years. Would I tell a beginner to do that? No. But it worked because the tank had sightline breaks everywhere and the betta was added three weeks after the tetras.

The gourami advice though, I'd push back on. Honeys get sold as the "safe" community fish but I've seen them bully the hell out of tankmates in a small footprint, and dwarf gourami iridovirus is so widespread in the trade that you're rolling dice on a fish that might just die in six months. Not really a safer bet, just a different set of problems.

What temp was that 20 long running and how planted was it? Because if it was 80F with sparse cover, the plakat flaring at the corys makes total sense.

[zer0cool99]

BettaBoss's introduction order point is real, I've watched it play out with other semi-aggressive fish. But I think you're overselling it as the fix. Adding the betta last is mitigation, not a solution. You're still running an experiment where the failure mode is a fish that can't tell you it's stressed until it stops eating or its fins start shredding, and by then you've usually got fin rot to deal with too.

And the personality lottery is the part that kills me. Two plakats from the same spawn, same setup, different tanks. One ignored everything that moved. The other went after a nerite snail. A snail. He was flaring at it for a week before I gave up and moved him. You can't plant and driftwood your way out of a fish that's just wired aggressive. That's not a variable you control, that's a coin flip you're making on the fish's behalf.

On the gourami advice I'll half-take the L. Honeys absolutely can be little tyrants in a small footprint, and the iridovirus thing is real enough that I don't buy dwarf gouramis anymore. But my point wasn't "gouramis are safe," it was "at least when a honey goes bad you can see it coming." A betta hides in the corner and quietly declines. Whole different experience for someone who's new and doesn't know what they're looking at.

Also your post cut off. Whatever the temp question was, mine sit at 78-80, and the corys have always been fine with that range.

[greg_ohio]

The personality lottery thing is the whole ballgame and nobody wants to admit it. I had two bettas from the same Petco shipment, both crown tails, both in identical 10 gallons. One lived with a school of harlequin rasboras for two years and never so much as flared. The other murdered a mystery snail and then sat in the corner staring at the glass like he was plotting. Same water, same food, same plants. So when someone says "it worked for me," I always want to know: worked for how long, and was the fish actually happy or just not dead yet?

BettaBoss, your intro order point is legit though. I've seen the same thing with rams. Adding the aggressive-ish fish last into an established tank does seem to calm things down. But zer0cool99 nailed it, that's mitigation not a fix. You're still rolling dice, just loaded dice.

One thing nobody brought up, temperature. Bettas want 78-80. A lot of the "community" tetras and rasboras people pair them with are fine at that, but corys prefer it cooler, and if you run the tank at 76 to split the difference everybody's mildly uncomfortable. Might be why so many of these setups limp along instead of thriving. Ran mine at 79 for the corys and they were fine but I always wondered.

Anyway if you're set on a community tank and don't want the headache, just stock to the tank, not to the fish you fell in love with at the store. This 20 gallon stocking guide is a decent starting point. Betta is not on the list for a reason.