Guides for real fishkeepers.
We answer the questions fishkeepers actually ask, in plain language. Hose sizes, guard slots, spray bars, and more.
How to Build an Aquarium Lid: DIY Fish Tank Screen Top
You cannot buy a lid for every tank size, so keepers build them. Here is the parts list, how much to buy for nine common tanks, and the build steps.
Aquarium Snail Trap: How a Baited Trap Works and How to Get Rid of Pest Snails
A snail trap is a baited cup with a funnel lid. See how the mechanism works, what to bait it with, and why a trap manages a snail population instead of ending one.
How to Get Rid of Duckweed in an Aquarium: Scoops, Rakes, and Surface Skimming Compared
Duckweed grows back from one frond, so one pass never finishes it. Here is how scoops, rakes, combs, and skimming compare, and how to clear a tank safely.
Fish Breeder Box vs Breeder Net: Fry Saver Sizing and What the Slot Width Means
A fish breeder box holds its shape. A breeder net does not. See the real sizes, the two slot widths, and what a slot width actually tells you.
Aquarium Feeding Ring and Nori Clip Guide: Floating Rings, Magnetic Seaweed Clips, and What Each One Is For
A feeding ring and a Nori clip look related but solve two different problems. Here is what each one does, how each one mounts, and the sizes we print.
Aquarium Heater Guard Sizing: Guard Bores, Heater Diameters, and Which Heaters Are Not Round
Two bores, four lengths, and a sourced list of the three popular heaters no round guard fits.
Aquarium ATO Sensor Mounts and Dosing Container Holders: Float Switches, Optical Sensors, and Bottle Sizes
Most ATO sensors are not round, and most reef dosing containers are not round either. See which sensors take a mount, and which bore each holder is cut for.
Coral Frag Rack Sizing Chart: Plug Stem Sizes by Brand, Hole Sizes, and Mounts
Frag plug stems come in four published sizes, not one. Find your plug brand, get the hole size, then pick a magnet, rim hook, or standoff rack.
Aquarium Overflow Silencer: How to Quiet a Noisy Overflow
A noisy overflow is almost always trapped air, a small standpipe, or no air gap. See what causes the gurgle and how a push-on silencer helps.
Sump Baffle Clip: What It Is and How to Size One
A sump baffle clip is a U channel that holds a baffle panel square. See what it does, how to size one, and how to glue it in.
Power Filter Media Basket: AquaClear, Tidal, and Penguin Basket Mods Explained
Refillable media baskets for AquaClear, Seachem Tidal, and Marineland Penguin filters. Stop rebuying cartridges. See what an open basket changes.
Powerhead Guard for VorTech: Keep Fish and Snails Off the Impeller
A powerhead guard is a slotted cage that keeps fish, snails, and anemones off a reef pump's impeller. See fit for the VorTech MP10, MP40, and MP60.
Probe, Controller, and Heater Mounts for Your Aquarium
Printed clips and brackets that hold a probe, a controller box, or a heater in place. See sizes for a 12mm probe, the INKBIRD ITC-308, and more.
DIY Surface Skimmer vs a Printed One: Fixing Aquarium Surface Film Fast
A film on your water surface blocks oxygen exchange. See the classic DIY bottle skimmer fix, and when a printed weir box does a cleaner job.
Filter Sock Holder Sizing: Cups, Socks, and Sump Chambers Explained
A filter sock holder is a cup that holds floss or media in your sump, instead of a cloth sock. See how it works and what fits today.
Reef Light Shade Fit Guide: AI Prime, Kessil, Radion, and Hydra
A reef light shade wraps your fixture and blocks glare and room spill. See sourced sizes for the AI Prime 16HD, Kessil A360X, Radion, and Hydra.
Fish Guard vs Shrimp Guard: Which Intake Guard Fits Your Tank
Fish guards and shrimp guards use different slot widths. See the difference and how to pick the right intake guard for your tank.
Reef AIO Media Basket: Fitting a Refillable Basket to Your Nuvo Fusion or Nano Tank
A refillable media basket for your all in one reef tank's back chamber. See what fits the Nuvo Fusion 20 and Nano 10 today.
Which Hose Fits Your Filter: Eheim, Fluval, and JBL Hose Sizes by Model
Eheim, Fluval, and JBL all size their hose differently. Find your model, read its size, and see the adapter that bridges the gap.
Shrimp Guard and Intake Guard: How to Stop Shrimp and Fry From Getting Sucked Into Your Filter
Shrimp and fry get pulled into filter intakes fast. See why it happens, what keepers already try, and how a sized guard helps.
Is PETG Safe for Aquariums? Aquarium Safe Plastic Explained
PETG is the material the aquarium hobby already trusts for printed parts. See what that trust is based on, and what we do and do not promise about your livestock.
Eheim Classic Hose Size: 2213, 2217, and Every Model's Hose Diameter
Every Eheim Classic model sizes its hose a little differently. See the exact intake and discharge size for the 150, 250, 350, 600, and 1500XL, straight from Eheim's own spec pages.
Canister Filter Spray Bar vs Stock Outlet: Aquarium Flow for Planted Tanks
A spray bar spreads your filter's return across several holes instead of one stream. See when that helps, and when your stock outlet is already enough.
Canister Filter Too Loud? How to Quiet a Noisy Canister Filter
A loud canister filter is almost always trapped air, a worn impeller, or cabinet vibration. See the most common causes and how to check each one yourself.
Lily Pipe Setup and Positioning for Planted Tanks
Softening the hose, mounting position, depth, and CO2 diffuser placement, in one setup guide. Works whether you run glass or PETG lily pipes.
Glass vs PETG Lily Pipes: Which Lily Pipe Should You Buy
Glass lily pipes look great but can crack or shatter. See how PETG compares on fit, clarity, color, and durability.
Fluval Media Basket Setup: Canister Filter Media Order Explained
Filter media has an order: mechanical, biological, then chemical. See why it matters and the most common Fluval media basket mistakes.
Shrimp Guard Compatibility Chart: Filter Models, Intake Sizes, and 1.5 mm Guards
Find your filter model, read its intake size, and see which shrimp guard it takes. Sourced from each maker's own hose specs.
Canister Hose Clamps and Clamp Grooves: Do You Need One
Most canister hose loops hold fine without a clamp. See when one is worth adding and how our clamp groove is sized.
Fluval Flex and Fluval Spec Accessories: Media Baskets, Spray Bars, and What Actually Fits Today
Fluval Flex and Spec tanks are some of the most modded aquariums out there. See which baskets we make for each one, and what owners mod most.
Fluval Hose Size Chart: 14.5 mm and 17 mm by Filter Series
Fluval uses two hose sizes across its whole canister range. See which series takes which, with Fluval's own part numbers.
Canister Filter Losing Prime or Hose Leaking? Check Your Barb Fit First
A canister filter that keeps losing prime or a hose that drips is not always a bad filter. A loose or mismatched barb fit is a common, fixable cause.
Turtle Tank Canister Filters: Hose Sizes, Spray Bars, and Intake Guards for Aquatic Turtles
Aquatic turtle tanks run the same canister filters and hose sizes as fish tanks. See the sourced Zoo Med Turtle Clean sizes and what fits.
Hydroponic and Aquaponic PVC Fittings: Spray Bars, Adapters, and UV Mounts for Schedule 40 Systems
Hydroponic and aquaponic systems run the same Schedule 40 PVC and vinyl tubing as aquariums. Here is which of our parts carry over, and which do not.