Stability Tank Stabilization System, 500 ml

I’ve used Stability across multiple tanks and it’s become a staple in my routine. It reliably helps establish and support the beneficial bacteria that keep ammonia and nitrite in check, so day‑to‑day running is smoother and fish stay comfortable. What I notice in real use New setups settle more predictably, with fewer “new tank” wobbles. After filter cleaning, media changes, or adding new fish, the tank stays stable rather than spiking. No clouding or residue; it’s clean and easy to dose. How I use it (simple routine) New tanks: shake the bottle well and dose per label for the first week. Maintenance: add a dose after larger water changes, filter clean‑outs, or when swapping media. Extra protection: a top‑up when introducing new livestock gives the bacteria a helpful boost. Why it works for me It’s “set and forget”: no special storage fuss, and it plays nicely with sponges, ceramic rings, and premium biomedia. Scales to any filter—HOB, internal, canister, or sump basket. Great value when you run more than one aquarium; the bottle stretches a long way. Tips for best results Put mechanical filtration (sponges/floss) before your biomedia so debris doesn’t smother the bacteria. Don’t over‑clean: rinse media in old tank water, not tap water. Keep good flow and oxygenation; bacteria thrive in well‑oxygenated water. Follow the label, and if you use UV/ozone, pause it for a few hours after dosing. Verdict Simple, dependable, and effective. Stability is the bottle I reach for whenever I start a tank, refresh filters, or just want extra peace of mind. It’s earned a permanent place in my kit—highly recommended.

Used this during a fresh setup and again after a major water change—didn’t lose a single fish. Dosed as directed for 7 days and saw no ammonia or nitrite spikes. Water stayed clear, fish stayed active, and no weird smells or reactions. I’ve used it in both planted and bare-bottom tanks—works well with cichlids, shrimp, and fry. Doesn’t cloud the water, and it mixes clean. Bottle’s compact and easy to stash, and the dosing cap’s accurate enough for small tanks. It’s not magic, but it does what it says—keeps things stable when you’re starting fresh or making big changes. I keep a bottle in the gear stash for emergencies and new builds. 👍 Pros ✅ Fast-acting—supports tank cycling and resets ✅ No clouding—water stays clear ✅ Safe for all fish types and inverts ✅ Compact bottle—easy to store ✅ Works with planted and bare setups 👎 Cons ❌ Needs daily dosing for full effect ❌ No visible change—relies on trust and test kits ❌ Cap can drip—wipe after use ❌ Not a cure-all—still need proper filtration 🧭 Personal Review If you want a bacteria booster that keeps your tank stable without the faff, Seachem Stability earns its spot. I’ve used it across new builds and heavy water changes—no drama, just clean results and peace of mind. Proper stash-ready gear for anyone who wants their tank sorted and stress-free.

I’ve been really impressed with how well the Seachem Stability Tank Stabilisation System works in my aquarium! This product makes establishing and maintaining a healthy biofilter so much easier, whether I’m setting up a brand‑new tank or giving my established system a boost. Stability contains a powerful blend of beneficial aerobic, anaerobic, and facultative bacteria that help break down waste, ammonia, nitrite, and nitrate, which is vital for keeping water quality stable and fish thriving. What I particularly love is how gentle and safe it is; it’s completely harmless to fish, plants, and invertebrates, and there’s no risk of overdosing even if you accidentally put in a little extra. The dosing is straightforward, and I’ve seen noticeable improvements in water clarity and overall tank balance after using it during water changes and when cycling new setups. Overall, it’s a dependable, high‑quality product that gives me confidence that my aquarium’s biology is well supported, every day. Highly recommend for both beginners and experienced aquarists!

When I was cleaning the fish tank, I accidentally cracked it and needed to emergency-move the fish to a new tank. Because the old tank was an all-in-one, the filter had to be replaced, along with all of the water.. So the fish suddenly found themselves in a brand new tank with zero good bacteria to keep things balanced. Fresh water, clean gravel, brand new filter..... Sounds perfect... until the algal bloom kicked in. It only took about 6 hours before the water was so milky that you couldn't see the back of the tank. I did a water change, which half-helped, but the bloom was back the next morning. So I got some stability. I remembered getting it when we first got the tanks about 6 years ago, and it helped back then too. It arrived next day (Thanks Amazon) and I put it into the tank. By the end of the first day after adding the solution, the bloom had stabilised. It wasn't getting any milkier. So I did a partial water change and added a drop more to replace the stuff lost in the water change. By the next morning, things were getting better. 48 hours later, and the water was almost clear again. Well worth the money. Very fast acting!

I really like it (needs a bit more than reccomended) but on the whole it does what it needs to do. I add it to the filtration after a water change after the filter is turned back on and it often keeps the water parameters stable so pretty happy with this purchase.

I accidentally left my filter off for a day, but a quick dose of Stability stopped any ammonia spikes in their tracks. It’s a five-star, high-quality essential for any fish keeper. I love that the bacteria are 'spook-proof'—they don't just die off if the temperature or pH fluctuates slightly like other brands. A proper professional-grade tool.

Good quality does what is says happy with this

Seachem Stability is an outstanding product to get water full of beneficial bacteria in tank .Had cycled my fish tank for 2 months and after introducing fish had a crash but this product along with Seachem prime saved me from disaster I for one would not purchase anything else but Seachem .They have a fantastic range they may well be a bit dear but you get what you pay for.

Goede service. Na 2 dagen binnen zoals vermeld.

Bonne aide au démarrage d un bac

Produto de excelente qualidade!!!!

Been using this product for years, works great!

El producto es muy bueno y ha llegado en óptimo estado, lo que si puedo recomendar es comprar el grande de 500ml ya que el envío lo cobran a parte y tiene el mismo costo que uno de 100ml, así que si lo van a necesitar otra vez se evitan ese gasto de envío pagándolo 1 vez.