Penn Plax Bubble Wall Diffuser 23″ Out of stock SKU: PPX33 Category: Aquarium Accessories Related products Foam Base 12×15 (use 3 For 36″ Tank) (PKT 10) Ammorid Insert Aquaclear 300 / 70 Ammorid Insert Aquaclear Mini / 20 (SOLD OUT) Carbon Insert Aquaclear 300 / 70