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Description
[ARRIVING 14-MAY-2026] Otocinclus Arnoldi Great for Shrimp Tanks and Algae Control 2-4cmOtocinclus arnoldi (Arnolds Oto Catfish) Gentle algae grazer for established nano tanks Quick Facts Size: ~34 cm Tank size: 2060L+ Difficulty: Moderate Temperament: Peaceful Best kept: Groups (4+) Plant safe: Yes Is this for you? Good if: Established tank (34+ weeks) Looking for light algae grazing support Peaceful community setup Willing to keep a group Avoid if: New or unstable tank Expecting a full algae solution Aggressive tank mates Keeping only
Otocinclus arnoldi (Arnold’s Oto Catfish)
Gentle algae grazer for established nano tanks
Quick Facts
- Size: ~3–4 cm
- Tank size: 20–60L+
- Difficulty: 🟡 Moderate
- Temperament: Peaceful
- Best kept: Groups (4+)
- Plant safe: Yes
Is this for you?
✔️ Good if:
- Established tank (3–4+ weeks)
- Looking for light algae grazing support
- Peaceful community setup
- Willing to keep a group
❌ Avoid if:
- New or unstable tank
- Expecting a full algae solution
- Aggressive tank mates
- Keeping only one
Why this fish?
Otocinclus arnoldi is one of the smallest and most peaceful catfish available, making it ideal for nano aquariums. They stay small, are plant-safe, and gently graze on soft algae and biofilm without disturbing your setup.
Common mistakes
- Adding to new tanks → high mortality
- Expecting them to clean all algae
- Keeping them alone
- Not enough natural food (biofilm)
- Keeping with aggressive feeders
Care made simple
- Temperature: 22–26°C
- Diet: Biofilm + algae wafers
- Group size: 4+ recommended
- Water: Clean and stable
- Tank: Established setups only
Pair with
- Algae wafers
- Driftwood
- Sponge filter
- Live plants
NTA Insight:
Most issues with Otocinclus come from unstable tanks and lack of food — not shipping. If your tank is too new or too clean, risk increases significantly.
Most issues with Otocinclus come from unstable tanks and lack of food — not shipping. If your tank is too new or too clean, risk increases significantly.
FAQ
Do Otocinclus eat all algae?
No. They mainly eat soft algae and biofilm.
Can I keep just one?
No. They do best in groups of 4 or more.
Why did my Otos die quickly?
Usually due to new tanks, lack of food, or stress.
Do they need feeding?
Yes. Supplement with algae wafers.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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★★★★★ 5
Perfect for School
Color: Blue/Silver-Tone/Digital
Purchased as a for a middle schooler who isn’t allowed any electronics at school during school hours. Helps keep her on task without breaking the smart device policies. Perfect “old school” way to work.
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Reviewed in the United States on March 18, 2026
★★★★★ 3
hard to read display, no manual included.
Color: Black/Black/Digital
I haven't decided yet whether or not I will keep the watch. Problem is there is no instruction manual attached and you cannot find one online. However if you call Timex support they will email you the manual if you give them the model number which is included in Amazon's product description. However even with the manual watch is very hard to set. It lacks some functions normally Timex has like time can only be set up there is no down button. And most importantly display is minuscule. So it is really hard to read to set. Watch is a ladies watch. It is small and I like it a lot. But buttons are hard to operate and it is hard to read.
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Reviewed in the United States on April 17, 2025
★★★★★ 5
Great item
Color: Black/Silver-Tone/Digital
Great item
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Reviewed in the United States on March 5, 2026
★★★★★ 5
My boyfriend loved it!
Color: Ingram Black
I have total and complete confidence that you will be 100% satisfied when you purchase this product and begin to use it. I will definitely be buying more products from this vendor again in the near future. I would highly recommend this seller to everyone including my friends and family members. I was searching for a new wallet for my boyfriend for his birthday and wanted one that would accommodate all of his cards. His old wallet was falling apart but this one does not seem like it will do that as it is such good quality and seems to hold a lot of stuff inside it. He was super happy when he received it and has been using it for about a month now and it still looks good as new. I’m thinking of getting this for other members of my family who need a new wallet. The leather is smooth and in great condition, no imperfections. The trifold is perfect for anyone who is looking to store a bit more in their wallet. I shopped around for a bit before choosing this one and I’m happy I chose this. Fossil really does make great products and I’m sure I’ll be buying more in the future. I like the simplicity of the design; it’s not too flashy but nice enough to show that it really is high quality. Young or old, any man (or woman) will be pleased with the purchase or gift of this wallet. I also really liked the color as it was super rich and dark looking, not dull at all. Really great and a staple for any man (or woman) looking for a new and sturdy wallet.
The shipping for this product was just on time as promised and the product was just as described so that is great!! It just works just perfectly and it is exactly what I was looking for! What an awesome product, I’m glad that I came across this product when I did. This is a great product to invest in, as it is very affordable and seems like it will last for a long time – you should try it out. My reviews are my very own opinion of the product received and just my opinion. Everyone is different and could have a different opinion of a product. I do not receive any monetary payment for my reviews, and I always keep them honest. Therefore, you have no need to worry about whether or not my review is genuine, because I’m telling you, it is. If after my initial review something changes I DO make sure that I go back and update the reviews, for good or bad reasons. I am under no obligation to provide a positive review and received no incentives or rewards for doing so, as I previously mentioned. My aim is to highlight features and drawbacks that I would want to know about as a buyer, not hype the product for the manufacturer to increase sales. My remarks are sincere and true. I work very hard trying to write insightful and thoughtful reviews for each item. My hope is that these reviews are helpful to others who may be interested in potentially purchasing this product for themselves or as a gift for others who may be interested in the product. Please let me know how I am doing by voting “YES” if you think that my review helped you in any way. If it did not, please comment with how I can improve because this helps me to be a better reviewer. I hoped you enjoyed reading.
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Reviewed in the United States on September 28, 2016
★★★★★ 5
Timeless design with excellent quality!
Color: Wilder Black
I love the sizing and material, it feels well made and durable. While some might find it a bit small, I think the size is just right for its purpose. It’s practical, stylish, and the simple design makes it look great anywhere.
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Reviewed in the United States on April 18, 2026