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Best Aquariums & Fish Subreddits (November 2026)

Looking for the right aquariums and fish community on Reddit? Here is the lay of the land. We checked the communities Reddit returns for “aquarium” and “fishkeeping”, kept the public, safe-for-work ones with at least 25,000 members that are still posting, and ranked the 5 that remain by size. Together they have 2.3M members.

How the aquariums and fish communities compare

A few giants dominate — r/Aquariums, r/PlantedTank and r/shittyaquariums together account for 90% of the combined membership. The oldest is r/Aquariums, founded in 2009, and every community here is more than five years old — this is a long-established corner of Reddit.

The 5 biggest aquariums and fish subreddits

  1. A
    r/Aquariums ↗ 1,555,261 members · +1.2K since Oct 26 · since 2009

    The subreddit for anything related to aquariums! Come here to enjoy pictures, videos, articles and discussion. We're also here to help you if you need advice.

  2. P
    r/PlantedTank ↗ 360,882 members · since 2011

    A place for aquatic flora and fauna enthusiasts! Whether you have a question to ask or a planted tank to show off, this is the place.

  3. S
    r/shittyaquariums ↗ 148,406 members · since 2015

    Find a shitty aquarium on the internet or in the wild? Post it here!

  4. A
    r/aquarium ↗ 132,263 members · ~46 posts/day · since 2009

    The number 1° subreddit for all you aquarium fanatics out there! Don't forget to read the rules before posting!

  5. A
    r/AquaSwap ↗ 98,486 members · ~25 posts/day · since 2012

    A friendly international place where everything aquatic can be traded, sold, bought, or given away!

Choosing where to post

Big subreddits give a post the widest audience, but they also bury it quickly; the mid-sized communities on this list are usually friendlier for questions and first posts. Always read the rules in the sidebar first — each community is run by its own volunteer moderators. Our guide to searching Reddit explains how to dig through any of these communities, and the subreddit info tool gives you the stats of one we don't list.

Frequently asked questions

What is the biggest aquariums and fish subreddit?

r/Aquariums is the largest, with 1,555,261 members, followed by r/PlantedTank (360.9K) and r/shittyaquariums (148.4K).

Which aquariums and fish subreddit is the most active?

By new posts per day, r/aquarium leads with about 46, ahead of r/AquaSwap (25). Counts are averages over the last seven days.

How many aquariums and fish subreddits are there?

We list 5 active, safe-for-work aquariums and fish communities with at least 25,000 members each, 2.3M members in total (people can be in several). Reddit has many smaller ones too; our guide on searching Reddit shows how to find them.

What is the oldest aquariums and fish subreddit?

r/Aquariums, created on Nov 10, 2009.

Are these aquariums and fish subreddits safe for work?

Yes. Every community on this page is public and not marked 18+ by Reddit, and we filter out communities whose name or description points to adult content.

Data: Reddit's public subreddit search and the Arctic Shift archive (Nov 6, 2026), growth from SubMouse's weekly snapshots. Member counts of communities outside our Top 1000 come from the archive and can lag a little. Not affiliated with Reddit.