Fish & Aquarium Signs

For the people whose living room centerpiece is a tank, whose vacations are quietly planned around water changes, and who can identify every fin on a betta at a glance. This collection is for the freshwater crowd, the reef tank crowd, and the weird-fish-people crowd we love most.

Every sign here is a novelty humor sign, not an actual warning or safety notice. They simply look official enough to post above the tank, the filter, or the door of the fish room that guests enter only with proper supervision and advance notice.

All fish and aquarium signs are made in the USA and exclusive to Designs by Linda Nee. Each one is printed directly onto heavy gauge rust-proof aluminum using UV resistant ink, with no decals and no vinyl. Species covered include betta fish, goldfish, clownfish, angelfish, cichlid, oscar, plecostomus, axolotl, archerfish, gourami, anemone, and more from both freshwater and reef tanks.

Signs come with pre-drilled mounting holes and are ready to hang straight out of the package. Above the aquarium, on the fish room door, in the home office where the tank lives, or gifted to the aquarist in your life who has strong opinions about water hardness and even stronger opinions about their fish.

Strong starting points include the Betta Fish Warning Metal Sign, the Clownfish Aquarium Metal Sign, the Axolotl Warning Tank Decor Sign, the Goldfish Warning Metal Sign, and the Plecostomus Warning Aquarium Sign.

For more, browse the full Animal Signs collection, explore Reptile and Exotic Pet Signs for the tank-adjacent crowd, check out Aquatic and Marine Signs for ocean species, or visit Most Loved to see what fellow fish people keep choosing.

Frequently Asked Questions

Are these real warning signs or novelty aquarium signs?
Every sign in this collection is a novelty humor sign, not an actual safety or regulatory warning. They are designed to look amusingly official while celebrating the specific fish or aquatic creature that anchors your tank. No liability is implied, though your cichlid may feel otherwise.

What are the signs made from?
Each sign is printed directly onto heavy gauge rust-proof aluminum using UV resistant ink. There are no decals, no vinyl overlays, and nothing that peels. The design bonds to the metal itself for a finish that holds up indoors and in humid tank-adjacent environments.

Do the signs come ready to hang?
Yes. Every sign arrives with pre-drilled mounting holes so you can hang it immediately without additional hardware. They work above tanks, on walls, on doors, and anywhere else your fish have established territorial claims.

Which fish and aquarium species do you have signs for?
This collection includes betta fish, goldfish, clownfish, angelfish, cichlid, oscar, plecostomus, axolotl, archerfish, gourami, anemone, and more across freshwater and reef species. All designs are exclusive to Designs by Linda Nee and made in the USA. Do not see your fish? Reach out. We probably have it.