# sera SE.TLEN O2 PLUS aquarium water conditioner and oxygen booster 250 ml

**URL:** https://aio.lv/en/product--sera-67658--12268620
**Data updated:** 2026-04-16 14:14 (EEST)
**Category:** Other goods
**Manufacturer:** sera
**Manufacturer code:** 67658
**EAN:** 4001942034159
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.49 €
**Prices and availability valid until:** 2026-10-15 23:59
**Price without VAT (21%):** 19.41 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sera-67658--12268620

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.09.2026 | free |
| Pickup points | 05.10.2026 | 1.99 EUR |
| Courier delivery to door | 05.10.2026 | 4.99 EUR |

## Summary description

sera SE.TLEN O2 PLUS is an aquarium water conditioner and oxygen booster in a 250 ml bottle. Designed to improve dissolved oxygen levels and condition water for fish and aquatic plants, it helps support respiration, stress reduction and general aquarium health. Suitable for regular use during maintenance, after transport or when stocking fish.

## Long description

sera SE.TLEN O2 PLUS aquarium water conditioner and oxygen booster 250 ml is a liquid additive formulated to increase dissolved oxygen in freshwater aquaria and to condition water for fish and aquatic plants. The 250 ml bottle provides a ready-to-use concentrate intended for routine maintenance, use after fish transport or introduction of new stock, and situations where oxygen levels may be temporarily reduced. The product aims to support respiration, reduce acute stress and improve overall water quality parameters that influence oxygen availability.
Advantages
sera SE.TLEN O2 PLUS combines oxygen-boosting properties with water-conditioning components in a single liquid. It is supplied in a compact 250 ml package for convenient dosing in small to medium aquaria. The formulation is designed to act quickly to elevate dissolved oxygen and to create safer conditions for fish and plants by helping to stabilise the water environment after disturbances such as transport or heavy feeding.
Suitable for
Freshwater community tanks and planted aquaria
Use after fish transport or when adding new fish
Regular maintenance to support respiration and reduce stress
Situations with temporarily reduced oxygen levels (e.g., after power outages or heavy bioload)
When it may not be suitable
This product is intended for use in freshwater aquaria and may not be appropriate for specific saltwater or marine systems without confirmation from the manufacturer. It is not a substitute for mechanical filtration, proper aeration equipment or addressing root causes of low oxygen, such as overstocking, high water temperature or poor circulation. For chronic oxygen deficiency, corrective changes to tank setup and maintenance are necessary in addition to additive use.
Key specifications
Form: liquid concentrate suitable for aquarium dosing
Volume: 250 ml
Primary functions: increases dissolved oxygen and conditions water for fish and plants
Intended aquarium type: freshwater
Usage frequency: suitable for routine use during maintenance and after disturbances
How to use
Follow the dosing instructions provided on the product label. Add the recommended volume directly to the aquarium water, distributing evenly across the surface to encourage mixing. Use during regular water changes, after transport of fish, or when stocking new fish. Observe fish behaviour after application; if unusual signs appear, perform a partial water change and consult product instructions. Maintain standard care practices, including adequate filtration and aeration, alongside product use.
What to consider before purchase
Verify that your aquarium is a freshwater setup before use
Consider aquarium volume to ensure the 250 ml supply meets your dosing needs
Check current water temperature, circulation, and stocking levels to address underlying causes of low oxygen
Read label instructions and safety information prior to first use
Usage recommendations
Use sera SE.TLEN O2 PLUS as a complementary treatment alongside proper aeration, filtration and routine maintenance. For temporary oxygen shortages, apply according to label directions and improve mechanical circulation if needed. For persistent issues, review tank stocking density and equipment performance rather than relying solely on chemical boosters.

## FAQ

### How much does the sera SE.TLEN O2 PLUS aquarium oxygen booster 250 ml cost, and is it available for purchase?

The price is 23.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 30.09.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All sera products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized sera service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12268620/68186547_large.webp