Fish Tank Submarine – Decor: How To Choose And Safely Maintain
We’ve all been there—staring at a beautiful, lush planted tank and feeling like something is missing. Maybe you want to add a touch of whimsy, or perhaps you’re creating a “sunken city” theme for your community aquarium.
You aren’t alone in wanting to add a fish tank submarine to your setup. It’s a classic piece of aquarium decor that brings a sense of adventure to your water column. But beyond the aesthetic appeal, there are important safety considerations to ensure your aquatic pets stay healthy.
In this guide, we’ll dive into how to select the right vessel, how to prepare it for your tank, and how to maintain that “sunken” look without compromising your water parameters. Let’s get your underwater expedition started.
Choosing the Perfect Fish Tank Submarine for Your Aquarium
When browsing for a fish tank submarine, it is easy to get caught up in the cool design. However, as an aquarist, your first priority is always the safety of your inhabitants.
Not all decorations are created equal. You need to look for materials that are inert and aquarium-safe. Avoid anything with peeling paint, sharp edges, or metallic components that could leach toxins into your water.
Materials to Look For
Always opt for high-quality resin or non-toxic plastic. These materials are generally safe, durable, and easy to clean. If you find a vintage-looking sub, check the underside for a manufacturer’s mark or a “non-toxic” label.
If the item feels heavy or like it might have a metal core, proceed with caution. Rust is the enemy of a healthy ecosystem, and iron oxidation can quickly swing your water chemistry in the wrong direction.
Size and Scaling Matters
Don’t overcrowd your tank. A fish tank submarine that is too large can block water flow, leading to dead spots where waste and uneaten food accumulate.
Ensure there is plenty of swimming room around the decoration. If you have a 10-gallon tank, a massive, multi-piece submarine will likely overwhelm your fish and make the tank look smaller than it actually is.
Preparing Your Submarine for the Tank
Never drop a new decoration directly into your aquarium. Even if it is brand new, it has likely sat in a warehouse or on a retail shelf collecting dust and potential contaminants.
The Cleaning Process
Start by rinsing your fish tank submarine under warm tap water. Do not use soap, detergents, or household cleaners. These chemicals are notoriously difficult to rinse off completely and can be lethal to fish and invertebrates.
If you want to be extra cautious, soak the item in a bucket of dechlorinated water for 24 hours. This helps leach out any surface residues that might have been left over from the manufacturing process.
Handling Sharp Edges
Many resin decorations have “hidden” sharp spots, especially around hatchways or periscopes. Run your fingers over every surface.
If you find a sharp edge that could snag a delicate fish fin—like those of a Betta or a Fancy Goldtail Guppy—use a bit of fine-grit sandpaper to smooth it down. It’s a simple step that saves your fish from potential injury.
Integrating the Submarine into Your Aquascape
A fish tank submarine looks best when it feels like it belongs in the environment. Rather than just dropping it in the center of the tank, consider how it interacts with your substrate and plants.
Creating a “Sunken” Appearance
To make the sub look like it has been resting on the ocean floor for years, bury the base slightly into your sand or gravel. This provides stability and hides the artificial-looking bottom edge.
You can also use aquatic plants to soften the transition. Anubias or Java Ferns tied to the submarine with fishing line or aquarium-safe super glue (cyanoacrylate) can make it look like nature is slowly reclaiming the vessel.
Managing Water Flow
Because a submarine is a solid object, it creates a current shadow. If you notice detritus building up behind the decoration, use a turkey baster or a small powerhead to keep the water moving.
Good circulation is vital for preventing the buildup of organic waste, which keeps your ammonia and nitrate levels stable.
Routine Maintenance and Cleaning
Over time, your fish tank submarine will likely collect algae. While a little bit of green algae can actually make the sub look more authentic, too much can become an eyesore or outcompete your live plants.
Cleaning Tips for Hobbyists
When it’s time for a deep clean, remove the sub during your regular water change. Use a dedicated, soft-bristled aquarium brush to gently scrub away algae.
If the algae is particularly stubborn, soak the submarine in a solution of one part hydrogen peroxide to ten parts water for about 15 minutes. Rinse it thoroughly in dechlorinated water until there is no smell of peroxide left before returning it to the tank.
Watch for Hiding Places
If your submarine has hollow sections, be aware that fish like to hide inside. Always check the interior of the decoration when cleaning to ensure no fish are stuck or hiding inside before you take it out of the tank.
Common Problems and Troubleshooting
Even with the best planning, you might run into minor issues when adding large decor. Here is how to handle them like a pro.
The “Stuck Fish” Dilemma
If your submarine has small holes or portals, check to see if they are large enough for your fish to swim through easily. If a fish can fit its head through, it might try to swim through—and get stuck.
If you have a curious species, use a piece of aquarium-safe filter foam or a small plant to block off any opening that looks “iffy.”
Leaching and Water Chemistry
If you notice your water parameters shifting (like an unexplained rise in pH or a strange chemical smell), remove the decoration immediately. Some cheaper paints can degrade over time. It is better to be safe and remove the item than to risk the lives of your livestock.
FAQ: Your Questions About Submarine Decor
Can I put a fish tank submarine in with my shrimp?
Yes, absolutely! Shrimp love exploring nooks and crannies. In fact, they will likely spend hours grazing on the biofilm that naturally grows on the surface of your submarine. Just ensure there are no small crevices where they could get trapped.
Will the paint on the submarine hurt my fish?
High-quality, aquarium-safe resin is inert. However, if the paint is chipping or flaking, it is time to retire the piece. Always buy from reputable aquarium brands rather than generic craft stores.
How do I stop algae from growing on my submarine?
Algae grows where there is light and nutrients. If your submarine is covered in algae, try moving it to a slightly more shaded part of the tank or reducing your lighting duration.
Is it safe to use super glue on my submarine?
Yes. Cyanoacrylate gel (the kind commonly sold as “aquarium glue”) is perfectly safe for fish and shrimp once it has cured. It is the best tool for attaching mosses or plants to your submarine.
Conclusion
Adding a fish tank submarine is a fantastic way to inject personality and a sense of narrative into your home aquarium. Whether you’re going for a post-apocalyptic vibe or a classic nautical theme, your fish will appreciate the new territory to explore.
By choosing high-quality materials, checking for sharp edges, and keeping up with regular maintenance, you ensure that your aquarium remains a safe and beautiful habitat. Remember, the best aquariums are the ones that reflect the personality of the keeper—so have fun, get creative, and enjoy your underwater voyage!
Do you have a submarine in your tank? We’d love to see how you’ve aquascaped it. Tag us in your photos and let’s keep the hobby growing!
