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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.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- 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]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 1067 reviews
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Product Reviews
★★★★★ 1
Did not work for my skin
I ordered this for a more natural at home remedy for my eczema but it did not work. Even after seeing a dermatologist and healing my eczema using this product did not help my skin sadly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 22, 2024
★★★★★ 5
Great Item! Performs better than any higher priced name brand foaming soap!
Scent: Mango, Size: 64 Fl Oz (Pack of 1)
One thing I don't like about foaming hand soap is when it doesn't foam. I mean c'mon, the title of the product says foaming, so it should, foam! I've tried numerous brands of foaming soap for my dispenser and I always thought my dispenser was the issue because the soap would never come out with a good lathering foam. Well, I finally found a product, and surprisingly a brand I'm unfamiliar with or ever seen in the stores that in my opinion has far exceeded my expectations when it comes to foaming hand soap. The foaming pump dispenses just the right amount without going overboard, and it makes the product last forever. I work a lot in a job where I am in constant need to wash my hands constantly so I go through tons of soap! I love that I don't have to spend a fortune, and the mango scent is really nice without being to overbearing. It lathers well, rinses well and makes my hands clean. It is a half gallon but trust me, as someone who washes their hands very often, more often actually, that it lasts long. I'm looking forward to trying the other scents from this brand. Oh, and it does make your hands smell as nice as the mango scent too which is a pleasant bonus. All in all, I'm satisficed with this foaming hand soap and pretty much have found my new favorite brand without costing me an arm and leg for something that may or may not foam well.
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Reviewed in the United States on April 20, 2021
★★★★★ 5
Great smell
Scent: Coconut, Size: 64 Fl Oz (Pack of 1)
I really like the smell of product. This is my second time ordering this.
It is more economical . Foam comes out smoothy . I don’t like a lot of scents but this is really a good one.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
★★★★★ 5
Great foaming hand soap.
Scent: Coconut, Size: 64 Fl Oz (Pack of 1)
Love this soap refill. Smells amazing and rinses easily without residue. Leaves my hands soft. It foams to the last drop too. The big bottle lasts a long time.
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Reviewed in the United States on September 14, 2025
★★★★★ 4
Good hand soap
Scent: Coconut, Size: 64 Fl Oz (Pack of 1)
This is a fragrant, good foaming hand soap. I have sensitive skin and it doesnt bother me, plus you can get multiple uses out of it due to it being just the liquid. I gave it 4 stars because it meets all the requirements however I do think its pretty expensive for a half gallon. The seller could do better on pricing affordability but other than that- it came on time and is a good scent (wish they had more to select from). This is my second time buying from this seller and each experience has been good overall. Would reccomend.
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Reviewed in the United States on February 25, 2025
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