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Ultum Nature Systems Controsand is a line of decorative sand substrates designed for use in planted aquariums and aquascaping. Kona Controsand is a rounded pebble gravel designed for freshwater aquarium use. Kona’s deeper tones can be used as a supporting feature or to create excellent contrast. Like other Controsands, Kona can be used alone or mixed with other substrates for a custom look in planted tanks, terrariums, paludariums and more.
Whether you're setting up your first aquascape, or you've been in the hobby for years, Controsand is easy to use. Just rinse the substrate gently to remove finer grains, then distribute to specific areas as a natural accent.

Key Features & Benefits
- Root Development Support: Controsand's unique granule composition encourages strong root development, ensuring your plants anchor securely into the substrate and absorb nutrients effectively.
- Compatible with Bottom-dwellers: Perfect for shrimp or other bottom-dwelling species that sift through sand.
Product Specifications
- Approximate Grain Size: 3 ~ 5MM
- Available Sizes: 3L and 8L bags
What's Included
- 1x bag of UNS Controsand - Kona
Overall rating: 4.9722223 / 5 from 36 reviews.
AI Generated Review Summary
UNS Controsand - Kona is a decorative sand substrate for planted aquariums, offering strong root development support and compatibility with bottom-dwellers. Its rounded pebble gravel provides a clean and nice-looking appearance, suitable for various aquascaping needs.
Summary topics
- Pebble Quality (18%): Based on a significant number of customers, the consensus is that the pebbles are perfect.
- Aesthetic Appeal (25%): Many customers expressed appreciation for the excellent looks of the product, mentioning its clean and nice-looking appearance.
Review topics: ["color","shipping","quality","pebbles","looks","substrate","gravel","order","tank","dust"].
Review highlights
- "It looks beautiful and the packaging was great, I'll be eventually switching all my tanks to controsoil." —
- "Nice looking smooth pebbles!" —
- "Perfect little pebbles" —
Reviews
Perfect little pebbles
"I've been searching for substrate that looks like little river pebbles and this one is perfect; I absolutely love it!"
My pleco is thrilled!
"He loves his new setup with river rocks and this new gravel!"
I like the color and
"I like the color and consistency, Uns always has quality stuff"
"Buce is a fantastic company to work with, very nice very helpful!"
Clean Look, Consistent Grain
"High-quality substrate with a uniform grain size and natural color. Easy to rinse, minimal clouding, and it looks great in the tank. Perfect for aquascaping and plant growth—very happy with this purchase."
Looks just like the picture.
"Looks just like the picture. I like it a lot for scatter gravel."
As advertised
"It looks like it does online in person. What more can you ask for from a gravel?"
pricing could be better
"the product is just as advertised, but pricing could be better"
Pdeffg
"Gorgeous material, can’t wait to use it, I’d recommend rinsing first as with any substrate it’s not perfectly cleaned"
Use These Tiny Pebbles to Add Details
"How does one review a 3l bag of pebbles? Mention the color, it's uniform, and matches well with the Maui sand. How did it flow from the bag to a container when dry? Flows well, very little dust. This is the 8th UNS Substrate I've purchased. Why so many? They work well in my use case."
Q&A
- How many Ls should I get for a 5gal tank?
- Hello Cassidy! Thank you for your question. Depending on how much you'd like, please feel free to use our convenient substrate calculator: Length x Width x Desired Substrate Height (in inches) Divided by 60 = Liters of substrate needed We hope this helps! Please contact us at support@buceplant.com if there is anything else we can assist you. Kindly, Team Buce Plant