Dophi Filter Box – Compact Aquarium Water Filter for Crystal Clear Tanks

The Dophi Filter Box series is a smart and compact aquarium water filter range designed to keep your tank clean, clear and healthy. With internal models like FC602, FC603 and FC604, this aquarium internal filter gives strong water circulation and multi-layer filtration without taking up much space in the tank.

Because the pump and media are built into one filter box for aquarium, installation is very simple. You drop it inside the tank, fix it with suction cups, plug it in and your water starts circulating immediately.

---

Models Covered: FC602, FC603, FC604

This listing includes three popular Dophi Filter Box models:

• Dophi Filter Box FC602 – compact internal filter for fish tank up to around 30 litres, with gentle but effective flow and low power use.

• Dophi Filter Box FC603 – medium size internal aquarium water filter for tanks up to about 55 litres, giving higher flow for better circulation.

• Dophi Filter Box FC604 – stronger power aquarium filter for tanks up to roughly 75 litres, ideal for community setups that need more filtration.

All three models are internal aquarium water filter units that sit inside the tank and are suitable for both fresh and marine water.

---

Why choose Dophi Filter Box as your aquarium water filter?

1. Multi-layer filtration for clean, clear water

Each Dophi Filter Box uses a multi-layer filtration system. Typically, the filter combines:

• Sponge media for mechanical filtration

• Carbon cartridge or similar media for chemical and basic biological filtration

Together, these layers trap visible dirt, reduce odours and support beneficial bacteria. As a result, your aquarium water filter keeps water bright and stable for your fish.

2. Quiet and energy-saving internal filter

The built-in water pump is designed to be:

• Quiet, so it does not disturb you or your fish

• Energy efficient, with low wattage for daily 24/7 use

This makes it a great internal filter for fish tank setups in bedrooms, living rooms and offices.

3. Easy cartridge replacement – no wet hands

One of the key benefits of this filter box for aquarium design is the simple cartridge system:

• Filter cartridges slide out from the top or front

• You can change them quickly

• You do not need to put your whole hand in the tank

Therefore, maintenance stays fast, clean and beginner-friendly.

4. Pump at the bottom for better dirt removal

The Dophi Filter Box has the water pump located at the bottom of the filter unit. This design:

• Pulls in dirty water from low in the tank

• Helps remove waste that collects at the base

• Improves circulation in hard-to-reach areas near the substrate .

So, your aquarium internal filter targets the areas where uneaten food and fish waste usually settle.

5. Flexible placement inside the tank

You can place this internal aquarium water filter in different positions:

• Attach it to the side glass using suction cups

• Use the hook (where supplied) to mount on the tank edge

This flexibility means you can direct the outflow toward the water surface for better oxygen exchange, or along the tank length for stronger circulation.

---

Model Comparison: FC602 vs FC603 vs FC604

Use this section to help customers pick the right aquarium water filter for their tank:

Dophi Filter Box FC602 – Small Tanks

• Recommended tank size: around 30 L

• Typical output: approx. 170–200 L/h

• Power: about 3 W

• Best for: nano tanks, shrimp tanks, betta tanks and lightly stocked aquariums

Choose FC602 if you need a compact internal filter for fish tank where space is limited.

---

Dophi Filter Box FC603 – Medium Tanks

• Recommended tank size: about 55 L

• Output: around 280 L/h

• Power: roughly 4.2 W

• Best for: community tanks with small fish such as tetras, guppies and barbs

Pick FC603 if you want a stronger internal aquarium water filter with more flow and a bit more filtration volume.

---

Dophi Filter Box FC604 – Larger Medium Tanks

• Recommended tank size: about 75 L

• Output: around 380 L/h

• Power: approx. 5 W

• Best for: heavier stocked tanks, growing fish and aquariums that need extra circulation

Go for FC604 if you want a powerful yet compact power aquarium filter for medium-sized tanks.

---

How to choose the right Dophi aquarium water filter

When selecting a Dophi Filter Box model:

1. Check your tank size

   • Up to 30 L → FC602

   • Up to 55 L → FC603

   • Up to 75 L → FC604

2. Consider your fish load

   • Light stocking → you can use the lower model

   • Heavy stocking → choose a higher flow model for stronger aquarium water filter performance

3. Think about space and layout

   • Smaller tanks may look cleaner with the compact FC602

   • Wider tanks may benefit from the extra circulation of FC603 or FC604

---

How to install your Dophi Filter Box (Step-by-step)

1. Unbox and rinse the filter media
   Take out the sponge and cartridges and rinse them gently in clean water to remove loose dust.

2. Assemble the filter
   Place the sponge and carbon cartridge back into the filter box for aquarium following the arrows or markings.

3. Position inside the aquarium
   Use the suction cups to attach the internal aquarium water filter on the tank glass. Keep it fully submerged and ensure the water outlet is not blocked.

4. Connect to power
   Plug in the filter and check that water starts flowing from the outlet. Adjust the direction of flow if the model allows.

5. Fine-tune the flow (if adjustable)
   Some versions allow you to reduce or increase the water flow. Set it so the fish are comfortable but the surface still moves for gas exchange.

---

Maintenance tips for long-lasting performance

• Clean the sponge regularly
  Every 2–4 weeks (or as needed), remove the sponge and rinse it in old tank water. This keeps the aquarium water filter free of clogs while preserving bacteria.

• Replace carbon cartridges
  Change the carbon or chemical media according to your bioload and usage. This helps keep odours and discoloration under control.

• Wipe the impeller and pump housing
  When flow drops, open the pump cover and gently clean the impeller. This keeps your power aquarium filter running smoothly.

• Avoid overfeeding
  Less waste means less work for your internal filter for fish tank, so feed only what your fish can eat in a couple of minutes.

---

Who is the Dophi Filter Box ideal for?

This aquarium water filter range is perfect for:

• New hobbyists who want a simple, ready-to-use filter

• Busy fish keepers who need reliable, low-maintenance filtration

• Nano and medium aquariums where an aquarium internal filter saves space

• Freshwater and marine tanks that need quiet and efficient internal filtration

Because the Dophi Filter Box combines pump, media and smart layout in one compact design, it is a strong choice for anyone who wants clear water with minimal hassle.

---

SEO-friendly FAQ (Optional – add as FAQ block)

Q1. Is the Dophi Filter Box suitable for both fresh and salt water?
Yes. The Dophi Filter Box series can be used as an aquarium water filter in both freshwater and marine aquariums when used with suitable media.

Q2. Where should I place this aquarium internal filter?
You can place the internal aquarium water filter on the side or back glass using suction cups. Make sure it is fully submerged and the outlet is not blocked.

Q3. How often should I clean the filter media?
In most tanks, cleaning the sponge every 2–4 weeks is enough. Rinse it in old tank water, not tap water, so useful bacteria stay alive.

Q4. Does this power aquarium filter make a lot of noise?
No. The Dophi Filter Box range is designed to be quiet and energy-saving, which makes it suitable for rooms where silence matters.

Q5. Which model should I use for a 60 litre tank?
For a 60 L tank, the FC603 or FC604 is usually best, depending on fish load. Heavily stocked tanks benefit from the stronger FC604 aquarium water filter.