Who’s ever bought a fish and come home with a surprise guest?

Hands up if you’ve ever paid for X and got X plus a little something extra. A “bonus” snail. A stowaway plant. Or, in my case this week: four amano shrimp to help the cleanup crew, and a tiny, wriggling mystery in the bag. Fry. I came home with fry. I didn’t order fry. The shrimp didn’t fill out a form. Yet here we are.

I’d gone in for amanos specifically — great algae grazers, peaceful, and they don’t breed in freshwater so you’re not suddenly running a shrimp farm. Or so I thought. What I hadn’t factored in was that the shop’s tank might have had more than amanos in it, or that a gravid something had left a present. Either way, when I got home and had a proper look in the bag, there it was: a wee fry, doing its best to look inconspicuous next to four fully grown shrimp. Spoiler: it didn’t. I noticed. My partner noticed. The fry was officially a guest of honour.

So now I’m doing what every sensible fishkeeper does: I’m watching it. Not in a creepy way. In a “I need to know what you are before I name you or panic about compatibility” way. Is it a platy? A guppy? A random danio that got swept up in the net? Your guess is as good as mine. It’s still too small to tell, and I’m not about to evict a baby on a hunch. So the tank has one extra resident, and I have a new hobby: Fry Watch. I check in the morning. I check at night. I’m weirdly invested. At this point I’m more excited to see what it turns into than I am about most of my planned purchases. The best things in this hobby are sometimes the ones you didn’t put on the list.

It got me thinking about the other surprise guests we all end up with. Pest snails are the classic. You buy one plant. One. Next month you have a snail democracy and you’re not sure who's in charge. (Spoiler: the snails are.) Some people hate them; some lean into it and call it a bonus cleanup crew. Then there are hitchhiker plants — a strand of something that looked like algae but is now clearly a fern having the time of its life. Or the “free” baby snail that came with the driftwood and is now the size of a small country. The hobby is full of stowaways. Most of them are harmless. A few are genuinely welcome. The rest we learn to live with, or rehome, or (in the case of pest snails) negotiate with. Good luck with that.

If you want to minimise surprises, you can quarantine new stock and give new plants a quick dip or a separate holding period before they go in the main tank. Peek in the bag before you leave the shop. But let’s be real: sometimes you don’t see the fry. Sometimes the snail is the size of a grain of sand. And sometimes the surprise is actually the best bit — a little mystery to solve, a tiny guest to root for. I’m team “let’s see what it is.”

So yeah. I bought four amano shrimp. I got four amano shrimp and a side of “???” I’ll report back when the fry is old enough to show its face — and its species. Until then, if you’ve ever come home with an uninvited (but sort of welcome) plus-one, you’re in good company. We should start a support group. Or at least a thread where we all guess what my fry is. Place your bets now. I’m holding out for something that doesn’t eat my plants.

For more on cleanup crews and adding new critters safely, see our cleanup crew guide and quarantine guide. And if you’re logging tanks and parameters (including “mystery fry, count: 1”), App-aquatic has you covered.