Equipment
Penn-Plax Ammonia-X AX-4 Cartridges (2-pk).
A 2-pack of ammonia-removing cartridges (AX-4) for Penn-Plax undergravel filters — slip them into the uplift tubes to pull harmful ammonia from the water column.
$4.99In stock
In-store purchase only. There is no online checkout on this site. Pick this up at our Erie store, or call us to arrange shipping.
- Brand
- Penn-Plax
- Condition
- new
- Fulfillment
- Local pickup — Erie, PA
Pick this up at the shop, or ask us to ship it. Shipping cost depends on the item, so call (814) 456-9445 and we'll quote it — payment is taken upfront before the order goes out.
What it's for
Underlined topics open the guide that explains how they work.
- removing ammonia from aquarium waterAmmonia & nitriteThe two things that kill fish in a new tank, until bacteria take over the job.In How to cycle a new aquarium: the nitrogen cycle, step by step
- replacement cartridge for undergravel filtersReplacement parts & media refillsCartridges, media refills and impellers. The parts that wear out on a schedule.In How Often to Clean a Fish Tank: A Simple Maintenance Schedule
- protecting fish from ammonia spikesAmmonia & nitriteThe two things that kill fish in a new tank, until bacteria take over the job.In How to cycle a new aquarium: the nitrogen cycle, step by step
- chemical filtration for new or stressed tanksChemical filtrationMedia that grabs dissolved things a strainer can't catch, like odors and tint.In How to build an easy freshwater sump — no drilling, no cut glass
Visit the store
660 East 14th Street,
Erie, PA.
Mon–Fri 12–6 · Sat 11–4 · Sun closed. Call ahead on livestock — what's on the floor rotates.