5+ Key Differences Between Fish Tanks and Planted Aquariums You Should Know

Are you struggling to understand the differences between fish tanks and planted aquariums? You’re not alone—and here at Terrarium, we’re breaking it all down so you can confidently choose the right setup for your needs. Whether you’re a first-time aquarist or someone looking to build a thriving underwater ecosystem, knowing how these two types of tanks differ is essential before you dive in.

Core Differences Between Fish Tanks and Planted Aquariums

Though both fish tanks and planted aquariums are water-based habitats, they serve very different purposes, and their setup reflects that. Let’s explore the key differences between fish tanks and planted aquariums:

Purpose: What’s the Main Focus?

Fish Tanks: The primary goal is to display and enjoy the beauty of the fish. Plants and decorations are mostly aesthetic and serve to enhance the environment for the fish to swim in.

Differences Between Fish Tanks and Planted Aquariums – Purpose

Planted Aquariums: The main focus is to create a self-sustaining underwater ecosystem, with Terrarium plants at the center. Fish are chosen to complement and support this ecosystem, not dominate it.

Size and Tank Design

Fish Tanks: Often vary in size and typically have framed edges with braces or rims to support equipment like lights or filters. They’re designed for easy fish viewing from multiple angles.

Differences Between Fish Tanks and Planted Aquariums – Size and Tank Design

Planted Aquariums: Designed with aesthetic harmony in mind. Frameless, rimless designs are common to enhance the natural look. Dimensions prioritize depth and layout balance for aquascaping.

Lighting System Requirements

Fish Tanks: Lighting is primarily used to showcase the fish and doesn’t require high intensity. As long as you can see your fish clearly, the lighting is sufficient.

Differences Between Fish Tanks and Planted Aquariums – Lighting System

Planted Aquariums: Require specialized lighting systems that support photosynthesis. Light intensity, color temperature (around 6500K), and duration must be carefully calculated for plant health.

Substrate and Bottom Layer Materials

Fish Tanks: Typically use gravel or sand as decorative substrate. It doesn’t need to provide nutrients, since plants aren’t a priority.

Differences Between Fish Tanks and Planted Aquariums – Substrate and Bottom Layer Materials

Planted Aquariums: Use nutrient-rich aquasoil or specialized substrate to support plant roots. The substrate plays a critical role in maintaining long-term ecosystem stability.

Filtration Systems

Fish Tanks: Use basic filtration to remove waste and maintain clear water. The filter’s power isn’t crucial unless the tank is heavily stocked.

Differences Between Fish Tanks and Planted Aquariums – Filtration Systems

Planted Aquariums: Require strong, stable filtration systems to maintain water quality and promote beneficial bacteria. A clean, biologically balanced environment is essential for both plants and fish.

Livestock Selection

Fish Tanks: Allow for a wide variety of fish, including large or aggressive species, provided they can coexist peacefully. The fish are the main attraction.

Differences Between Fish Tanks and Planted Aquariums – Livestock Selection

Planted Aquariums: Prioritize small, peaceful fish like tetras, otocinclus, shrimp, or pencilfish that won’t damage plants or disrupt the layout. The goal is a harmonious, balanced ecosystem.

Which Should You Choose as a Beginner?

If you’re just getting started and want something low-maintenance, a fish tank is a great option. It’s beginner-friendly, doesn’t require advanced lighting or substrate knowledge, and you can focus on picking beautiful, easy-to-care-for fish.

Beginner-Friendly Aquarium Setup – Fish Tank or Planted Aquarium?

But if you’re drawn to the art of underwater landscaping and excited to learn how to build a living ecosystem, a planted aquarium offers a deeply rewarding experience. Start with a small tank, a few hardy plants, and peaceful fish to ease into the hobby.

Terrarium hope this guide helps you clearly understand the difference between fish tanks and planted aquariums, so you can choose the setup that suits your lifestyle and interests. Both have their own charm—it just depends on what you want out of the experience.