Seachem

Seachem Stability Fish Tank Stabilizer - For Freshwater and Marine Aquariums 50 ml

$3.49$20.36

1804+ bought in the past month

About this item

  • TANK STABILIZATION: Seachem Stability will rapidly and safely establish the aquarium biofilter in freshwater and marine systems, thereby preventing the #1 cause of fish death: "new tank syndrome".
  • TREATMENT: Stability is formulated specifically for the aquarium and contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite, and nitrate.
  • BACTERIA GROWTH: The necessary conditions for the growth of Stability's bacterial strains encompass a very broad range. When other bacteria begin to die off (usually from high organic loads caused by the unknown death of an organism), Stability simply becomes more effective.
  • USE: Shake Seachem Stability well before use and turn off UV/ozone filter. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Then use 1 capful for each 80 L (20 US gallons) daily for 7 days. Fish and other aquatic species may be introduced at any time as long as the dosage is maintained for 7 days.
  • SAFE: The bacteria employed by Stability are non-sulfur fixing and will not produce toxic hydrogen sulfide. Stability is completely harmless to all aquatic organisms as well as aquatic plants, thus there is no danger of overuse.
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Product details
BrandSeachem
Liquid Volume50 Milliliters
Item Weight0.01 Kilograms
Item FormLiquid
ManufacturerSeachem Laboratories, Inc.
Technical specifications
item_weight0.01 Kilograms
departmentUnisex-Adult
manufacturerSeachem Laboratories, Inc.
item_model_number124
date_first_availableApril 8, 2008
item_package_dimensions_l_x_w_x_h3.66 x 1.34 x 1.26 inches
item_dimensions_lxwxh1.38 x 1.38 x 3.62 inches
brand_nameSeachem
target_audience_keywordfish
directionsShake well before use. Turn off UV/ozone. Use 1 capful (5 mL) for each 40 L (10 US gallons) on the first day with a new aquarium. Then use 1 capful for each 80 L (20 US gallons) daily for 7 days. Fish and other aquatic species may be introduced at any time as long as dosage is maintained for 7 days. For optimum biofilter performance use 1 capful for each 80 L (20 US gallons) once a month or with each water change and whenever introducing new fish or whenever medicating an aquarium.
warranty_descriptionWarranty
model_nameStability 50 ml
colorClear
size50 ml/ 1.7 fl. oz.
materialPlastic
age_range_descriptionAll Life Stages
number_of_items1
specific_uses_for_producthabitat
is_discontinued_by_manufacturerNo
product_dimensions1.38 x 1.38 x 3.62 inches; 0.35 ounces
best_sellers_rank#10,715 in Pet Supplies ( See Top 100 in Pet Supplies ) #84 in Aquarium Water Treatments

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Customer reviews

4.8745 ratings
  1. 588%
  2. 413%
  3. 30%
  4. 20%
  5. 10%

Customers say

Customers find the water stabilizer effective, with one mentioning it helped cycle their aquariums successfully.

★★★★★

Perfect product with my own opinion and flaws

VFebruary 6, 2026✓ Verified purchase

So I bought this product because my tank wasn’t really cycling and my eyes cycle my tank for two weeks so I’m gonna be giving the pros and cons for this products and if you really wanna buy it or not for the pros this definitely helps with a high ammonia if you’re having ammonia problems in your tank, you might not have the best bacteria colony, which is product helps a new tank syndrome and helps with just gaining a back to your colony tank definitely the good thing about this product cause it doesn’t really have a smell and during transit and never really leaked or anything. Another pro into this is that for the size you get it’s a pretty OK size I mean all I gotta say other than not judging the product the saying 50 ML‘s is enough for a small tank obviously I bought it for a 10 gallon because I’m not gonna pay fully for the entire bottle cause I’m not sure how the party would go. It’s a pretty good product overall it doesn’t seem to have any problems or anything now the cons this product definitely is an interesting product for the cons because people say it cycles 24 hours people say it cycles less than a couple hours. I find it that this product cycled my tank, barely at the mem from 24 hours to 72 hours. I find it that it would take a couple days for for me I found out it took a couple days to cycle which remind you I’ve been with fish for a while, set my own life so even with a lot of these conditions, it still took a long time, even though I’m not expecting it to take a long time just the false information. It really just depends on how you do it in your tank personally for me I dose my tank with it every couple days with five ML another con is that even though I put in the pros is pretty good for taking out ammonia again it really depends on the water conditions because before I dose this tank this tank has been cycling for two or three weeks with some of my biological thing, but then my tank had ammonia strike, and I tried this product, which is products not saying is not gonna get rid of your ammonia. It’s just the product itself like it’s not gonna clear up your take. It’s not gonna get rid of your ammonia so fast and personally for me is a good products. Give a five star rating because it actually a really good product but the cons there’s not really a lot of cons because the product is so good at ready Read more

★★★★★

Excellent product

ClKDecember 20, 2025✓ Verified purchase

Very good item it works great I use quick a few of the different seachem products and I have no complaints. This product is great. Read more

★★★★★

Works like a charm.

krisGLDecember 3, 2025✓ Verified purchase

If you need to help your water parameters get back to normal and safe for your aquarium, this is definitely a must. Follow directions on bottle and all will be better in a few days. Great to have on hand in case of a tank cycle crash as well. Read more

★★★★★

Great for cycling and water changes

CustomerDecember 18, 2025✓ Verified purchase

Love all seachem products, but this one in particular is a must have for cycling fish tanks and during water changes. Read more

★★★★★

Worked great!

Momma B.December 17, 2025✓ Verified purchase

I tried Quick Start before I tried thos, it didn't work at all. Went back to the drawing board and found this stuff, and it is working perfectly! Tank is almost fully cycled. Read more

★★★★★

Works with glowfish!

Tony PierreDecember 6, 2025✓ Verified purchase

Worked great with my glow tank, I started added about 5 days before adding the fish and they're all doing great a week later! Easy to use as well just fill the cap and put it in the water. Read more

★★★★☆

Still waiting

CbellJanuary 29, 2026✓ Verified purchase

Jury is still out on this one. I may have added to much ammonia during my cycle test and stalled the cycle. After a water change and lower ammonia levels we are still waiting for the aquarium to cycle. I purchased more and I'm following the instructions and still using it. Read more

★★★★★

Good for setup or emergencies

A. J. BertineDecember 16, 2025✓ Verified purchase

This stuff had my nitrates down overnight--I recently switched filters, and even though I left the old filter running beside the new one for two weeks, it still wasn't completely cycled and my tank spiked when I took the old filter out. Put in a capful of this and it was way better the next day so I don't have to shock my shrimp with a huge water change. Whew. Don't forget to shake it up well before pouring it in! Read more

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