How to Clear Green Water in an Aquarium With Sera Siporax

IGreen water is one of the most frustrating problems in fishkeeping. We needed to clear green water in an aquarium at the shop after one of our 40-gallon snail tanks turned so green you could barely see through the glass. This is the tank where we grow out snails for the shop, so clear water matters.

We did not want a quick patch. We wanted better filtration and better balance. So we added Sera Siporax to the filter and watched what happened.

The result got our attention.

What Causes Green Water in an Aquarium?

Green water usually comes from free-floating algae. It often shows up when light, nutrients, and biological filtration fall out of balance.

A tank does not have to be dirty for this to happen. Heavy feeding, long light periods, or weak biological support all play a role. In our case, filtration needed help.

What Is Sera Siporax?

Sera Siporax is a biological filter media made from sintered glass. Its porous structure gives beneficial bacteria a large amount of surface area to colonize.

Siporax is made out of Sintered Glass

Those bacteria help process waste and support a healthier aquarium. More biological surface area often leads to better stability, especially in tanks with a heavier load.

How We Used Siporax to Clear Green Water in an Aquarium

Here is exactly what we did.

Tank: 40-gallon snail grow-out tankProblem: Green water so thick you could barely see into the tankFilter: Hang-on-back filterChange we made: Added two handfuls of Sera Siporax

We did not add an algaecide. We did not do a blackout. We added Siporax and let the filter do its job.

The Results After Three Days

Within about three days, the tank looked much better.

The water cleared up.The bottom of the tank was visible again.The snails were easier to see.The plants looked better.Customers noticed the difference right away.

This was our result in this tank. Every aquarium runs a little differently, though improvement here was strong enough for us to keep Siporax in our filtration lineup.

Why Siporax Helped

Siporax did not hide the problem. It improved the biological side of the filter.

Green water often shows up when an aquarium is out of balance. Better biological filtration helps the system process waste more efficiently and supports steadier water quality. In this case, once the tank had stronger biological support, the bloom backed off.

How to Use Siporax the Right Way

Siporax works best when water flows through it steadily.

Place it in a filter where it gets good flow. Hang-on-back filters, canister filters, and sumps all work well. Rinse it lightly before use to remove dust from packaging. After adding it, keep testing ammonia, nitrite, and nitrate so you know how the tank is responding.

Siporax helps filtration, though it does not replace normal tank care. Good maintenance still matters.

When Siporax Makes Sense

Siporax is a strong fit for:

• tanks with recurring green water

• heavily stocked aquariums

• grow-out tanks

• filters needing more biological media

• hobbyists looking for better long-term stability

A Quick Reality Check

Bio media is a strong tool, though it is not the whole answer in every setup. If a tank gets direct sunlight, runs too much light, or gets overfed, those issues still need attention.

In some aquariums, a UV sterilizer clears green water faster. In others, the fix starts with feeding, lighting, or maintenance. In our snail tank, Siporax made a clear difference.

Final Thoughts

We like solutions built around better aquarium health, not quick cover-ups. In this case, adding two handfuls of Sera Siporax to a hang-on-back filter made a visible difference in only a few days.

If you are dealing with green water and your tank needs stronger biological filtration, Siporax is worth a look.

Sera Siporax is available at Fins For Grins in Broken Arrow. We also offer pre-seeded Siporax with live bacteria for hobbyists who want a faster filtration boost.

Fins For Grins1312 N. Elm Pl, Broken Arrow, OK918-578-9142