Aquarium Spawning Cone

Traditional spawning cones are terracotta — heavy, prone to chipping, and hard to sterilize between spawns. The Spawning Cone gives you the same function in tough, easy-to-clean PETG, with two real advantages over the ceramic original.

Void Black beats terracotta for contrast. Breeders deliberately pick dark cones so pale eggs stand out clearly against the surface —
black does that better than the traditional brown terracotta ever did.

Layer lines are a feature, not a flaw. Terracotta’s rough, porous surface is part of why eggs grip it well. The natural FDM layer texture
on this cone replicates that same adhesion surface — while staying non-porous, chip-proof, and easy to sterilize between spawns.

The design solves the two real risks with any spawning cone: trapped air and lost eggs. The open top acts as an air vent so the cone floods and sinks on its own instead of trapping a bubble, and the wide integral tray with a raised lip catches any eggs that fall off the cone instead of losing them to the substrate.

Details that matter:

• Egg-catch tray — a wide stable base with a raised lip catches
  stray eggs instead of losing them
• Self-flooding, no trapped air — the open top vents air on its
  own, so it sinks and stays put
• Three mop-tie holes — Ø5mm holes for tying off a yarn spawning
  mop or securing moss, also aids flooding
• Wide, stable base — spawning is vigorous; the tray resists
  tipping
• Printed in PETG — chip-proof and easy to sterilize (rinse +
  methylene-blue or dilute bleach soak, then dechlorinate) between
  spawns, unlike terracotta

Sized to your species:

• Small: Dwarf cichlids, small angelfish, shrimp
• Medium: Angelfish
• Large: Discus

Specifications:

• Material: PETG (aquarium-safe)
• Base diameter: S: 70mm · M: 90mm · L: 110mm
• Top diameter: S: 30mm · M: 36mm · L: 42mm
• Cone height: S: 105mm · M: 150mm · L: 190mm
• Tray diameter: S: 110mm · M: 130mm · L: 150mm
• Total height: S: ~108mm · M: ~153mm · L: ~193mm
• Wall thickness: 2.5mm (constant across sizes)
• Mop-tie holes 3× Ø5mm, polar-spaced around the wall

Care and Use:

• Drop it in and let the open top vent air — no priming needed, it
  floods and sits firm on its own
• Tie a sinking yarn mop or moss through the top opening or wall
  holes for egg-scattering species
• Between spawns: rinse and sterilize with a methylene-blue or
  dilute bleach soak, then dechlorinate before returning to the tank
• Hand wash only