Aquarium Bio Sponge Filter Fish Tank, Double – Betta Fry Shrimp and Medium Fish Foam Internal Filter – Fresh Water and Salt Water (XY-2831) (Black)

Description

The XY‑2831 is a dual‑sponge, air‑driven internal/foam filter designed for both freshwater and saltwater aquariums. It features two sponge blocks stacked on a weighted base, designed to deliver mechanical + biological filtration with gentle water flow — making it especially suitable for tanks with small fish (e.g., bettas), shrimp, fry, and medium‑sized fish.

🛠 Key Features

• Dual sponge blocks: Two foams increase surface area for beneficial bacteria and enhance mechanical trapping of debris.

• Mechanical + Biological filtration: Water is drawn through the sponge media, trapping debris (mechanical) while the sponge surfaces host nitrifying bacteria to convert ammonia/nitrite (biological).

• Low flow / gentle current: Because it is air‑driven and uses sponge media, the flow tends to be mild which is ideal for shy fish, fry and shrimp.

• Freshwater & Saltwater compatibility: The product is marketed for both types of aquariums.

• Compact size: Example specification: approx. 5″ L × 1.8″ W × 5.5″ H for the filter unit. (≈13 × 4.5 × 14 cm)

• Easy installation: Typically uses an air pump + airline tube (not always included) plus suction cups/weighted base to place in aquarium.

• Safe for fry/shrimp: The sponge media prevents small fry/shrimp getting sucked into the filter, which is a major advantage for breeding or planted setups.

🎯 Suitable Use‑Cases

• Tanks housing one or more betta fish (which generally prefer gentle current).

• Shrimp‑only tanks or tanks with shrimp + small fish (the filter is shrimp‑safe if flow is moderate).

• Fry tanks (baby fish) where you want minimal risk of fry being trapped in strong suction.

• Planted aquariums or lightly stocked tanks where you want biological filtration and gentle water movement.

• Saltwater nano tanks (though check compatibility & flow) as it supports both fresh & salt water.

XY‑2831 double bio sponge filter is a strong choice for aquarists seeking a gentle yet effective filtration solution—particularly for tanks that house bettas, shrimp, fry, or moderately sized fish. Its dual sponge design delivers combined mechanical and biological filtration, while the low‑flow, air‑driven operation creates a calm water environment that’s ideal for sensitive species.