About r/aquarium
In its own words:
The number 1° subreddit for all you aquarium fanatics out there! Don't forget to read the rules before posting!
The community was created on Dec 29, 2009, which makes it 16 years old. Among the 5 communities on our aquariums and fish list it is number 4 by size. Reddit files it under the “animals” category and its main language is English.
What sets r/aquarium apart
People mostly look and upvote here rather than comment — about 6.2 comments per post, against 13.0 for a typical large subreddit. For its size it is unusually busy: about 332.7 new posts a day per million members, more than 100% of the Top 100. Its rhythm is strongly tied to time zones: the busiest hour (14:00 UTC) sees about 9.0× as many posts as the quietest (05:00 UTC).
Top posts on r/aquarium this week
What the community upvoted most over the last seven days, as ranked by Reddit (collected Nov 9, 2026).
- Mantis Shrimpu/00stoll · Nov 6 · gallery
- Yellow Hellboy betta 🔥u/Skuy_Bettashop · Nov 2 · video
- Toot (Dragonfly Nymph) eats spaghettiu/Julesall · Nov 3 · video
- My latest projectu/pangogirl98 · Nov 3 · gallery
- Welcome to my 1000-gallon (4-ton) DIY home fish room!u/_aquamaniac_ · Nov 2 · image
- Terrestrial eel found living in moist soil 50 meters away from a water sourceu/Novel-Rabbit8914 · Nov 8 · image
- I turned off all the lights in the house to record this.u/Howdy132 · Nov 4 · video
- Long-finned hellu/GingerNinja119 · Nov 3 · gallery
- Told myself I’d NEVER get a betta. Anyway, here’s Baldur.u/No-Opportunity-3337 · Nov 6 · video
- Rummynose Tetrasu/Awkward_Respect9173 · Nov 6 · video
All-time top posts
The highest-ranked posts in the history of r/aquarium, from 2020 to 2026, ranked by Reddit.
- What's your favorite decoration?u/Snoborder95 · Oct 19, 2026 · video
- Corydoras leaving trailu/Plane_Letterhead_575 · Sep 21, 2026 · image
- Spontaneous fish sighted in a fishless cycling tank????u/Yagine · Feb 24, 2026 · video
- Am I pregnantu/CleanedupWater · Nov 8, 2023 · gallery
- Is it bad that my dingus cats drink from my kitchen tank?u/SuperbTap2562 · Sep 5, 2025 · gallery
- What to dou/Mountain_Advisor_219 · Jun 4, 2026 · video
- Filled my lava rock themed 10 gallon tank with 600 shrimpu/GotSnails · Oct 21, 2026 · video
- Kuli Loaches Bubble Surfingu/Plasticanimal-11 · Sep 22, 2026 · video
- They did what I said and put in 1000gal of peroxide lolu/Howdy132 · Jun 16, 2026 · video
- Danio slayeru/Such_Reply5826 · Jan 1, 2026 · video
What r/aquarium talks about
Looking at the titles of 225 recent posts (Oct 31–Nov 7), the words that come up most are “tank”, “fish”, “help”, “gallon” and “plants”. Other frequent themes are advice, shrimp, water, filter, betta and good. Recurring phrases include “gallon tank”, “fish tank”, “neon tetras” and “fish room”. By format, 33% are galleries, 27% are images and 23% are text posts.
Popular post flairs: Help (114), Discussion (32), Freshwater (21), Photo/Video (20), Showing Off (16), Plants (7).
Activity and best time to post
r/aquarium gets about 44 new posts a day. The public archive holds 85,152 posts and 530,598 comments in total, about 6.2 comments per post. Last week the busiest day was Monday (39 posts) and the quietest was Thursday (29). Posting peaks around 14:00 UTC and is lowest around 05:00 UTC.
Rules of r/aquarium
The moderators of r/aquarium list 8 rules. In short:
- No trolling, degradation or offensive allowed.
- No spam or advertising: This is not a selling sub!
- Tag any dead creatures as NSFW.
- No animal cruelty.
- No low effort posts (spam).
- Don't post crappy tanks, just to ridicule them.
- Don't re-post the same content within a month. Also keep some time between your posts.
- Use Flair correctly when creating a Post.
How to join
Open reddit.com/r/aquarium and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How big is r/aquarium?
r/aquarium has 132,263 subscribers.
How old is r/aquarium?
r/aquarium was created on Dec 29, 2009, so it has been around for 16 years. The oldest post in the public archive is from Dec 31, 2010.
How active is r/aquarium?
Very active: r/aquarium gets about 44 new posts a day (average of the last four weeks). Over its lifetime the archive counts 85,152 posts and 530,598 comments. In a sample of 225 recent posts we counted 196 different authors.
When is r/aquarium most active?
Based on post counts from Oct 31, 2026 to Nov 6, 2026, the busiest day was Monday and the quietest Thursday, and most posts arrive around 14:00 UTC, with the fewest around 05:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What is r/aquarium about?
The community describes itself as: “The number 1° subreddit for all you aquarium fanatics out there! Don't forget to read the rules before posting!” Recent post titles often mention tank, fish, help, gallon and plants. Most posts are galleries (33%).
Is r/aquarium safe for work?
Yes. Reddit does not mark r/aquarium as an 18+ (NSFW) community, and its own rules forbid NSFW content. SubMouse lists safe-for-work subreddits only.
How do I post on r/aquarium?
Join the community on Reddit first, then use “Create post”. r/aquarium accepts both text and link posts, with images, videos, galleries and polls enabled. It has 8 posted rules, starting with: “No trolling, degradation or offensive allowed.”; “No spam or advertising: This is not a selling sub!”; “Tag any dead creatures as NSFW.”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
Which communities are like r/aquarium?
Communities with similar topics include r/Aquariums (1.6M), r/aww (37.9M), r/cats (9.5M) and r/BeforeNAfterAdoption (1.2M).
Stats from public data (data updated Nov 9, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 9, 2026; top posts from Reddit’s public feeds). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/aquarium.