Aqua One Algae Block 20G
Aqua One algae blocks when placed in your aquarium will slowly dissolve over 7 to 14 days depending on water conditions and circulation and are designed to break down and prevent algae problems within aquariums and ponds, leaving your water crystal clear.
- Assists with the prevention of algae growth in tanks
- Easy to use
- One whole block treats a large area of 120L
| Specification | Weight: 20g |
|---|---|
| Usage Area | 120L aquarium or pond |
| Dissolution Time | 7 to 14 days |
FAQ
How long does it take for the algae block to start working?
The algae block begins to work within 7 to 14 days after being placed in the aquarium, depending on water conditions and circulation.
Can I use this block in a pond as well?
Yes, the Aqua One Algae Block is suitable for both aquariums and ponds.
Does the block need to be replaced regularly?
Once dissolved, the block is fully used. Replacement is needed after the block has dissolved, typically within 7 to 14 days.

Sam Alsop –
I’ve used this block in my 120L fish tank for two weeks. The water has become noticeably clearer and there’s no algae growth. It’s easy to place and doesn’t require any special tools or maintenance.
Andrew Lambert –
Works well in my pond. After placing the block, I saw a reduction in green algae within a week. The block dissolves slowly, which is good for consistent algae control.
Zoe Paterson –
Great product. I didn’t expect such a clear result after just one block. My tank has been algae-free for over a month now. Simple and effective.