About UnderWaterGreen

UnderWaterGreen is a free reference for people who keep freshwater aquariums. I built it because the answers to “will this fish work in my tank?” were scattered across forums, old articles and databases that disagree with each other. Here they sit in one place: care profiles for more than 1,200 fish, shrimp, snails, crabs and crayfish, more than 300 aquarium plants, around 185 practical guides, and free tools for checking tank mates and working out tank volume, heater size, filters and water changes.

The care advice is written for keepers anywhere in the world. Separately, the site has a marketplace where aquarium shops and hobby sellers in Nepal can list what they have, so people there can find it near them.

Who runs it

I run this site on my own, and I write and update the profiles and guides myself. I would rather write “this varies” or “little is known” than give a confident number that I can’t back up. If you spot something I got wrong, I want to hear about it.

How the profiles and guides are made

Each species profile gathers published information on the animal or plant, such as scientific descriptions, species databases and the references of breeders and specialist hobbyists, and puts it in one layout, so you can compare two fish side by side.

Temperature, pH, hardness and tank size are given as ranges, not single numbers. Healthy animals live across a spread of conditions and the references often disagree, so one figure would look more certain than it is. When a species is rarely kept or poorly documented, the profile says so instead of filling the gap with a guess. The guides explain the reasoning behind each recommendation, so you can adapt it to your own tank.

About the tools

The compatibility checker compares the size, temperament, water needs and feeding habits recorded on each profile, using rules based on common aquarium practice. Treat it as a planning aid, not a guarantee. Individual animals vary, so watch new tank mates closely after you add them.

Photos and illustrations

Many profiles still show a placeholder or an illustration while I collect real photographs. If you keep a species and have a clear photo you took yourself, you can send it from that profile’s page.

Corrections

Aquarium knowledge changes and mistakes happen. If something looks wrong or out of date, tell me through the contact page, with the page address and what you think should change. I check every correction and update the page when it holds up.

How the site is funded

UnderWaterGreen is free to read. Some product links are affiliate links, which can earn me a small commission at no extra cost to you, and sellers may pay to list in the marketplace. Neither decides what a profile or guide recommends. The Terms of Use have the details.