Philippine snake eel

Where they come from

The Philippine snake eel (Yirrkala philippinensis) is one of those sand-and-rubble bottom eels from the Indo-West Pacific area around the Philippines. In the wild they spend a lot of time buried with just the head poking out, waiting for food to wander by. If you set your tank up like that kind of neighborhood, you will see way more natural behavior.

Setting up their tank

These are not a "toss it in the reef" eel. Think more like a species-focused, escape-proof predator setup with a deep, soft bottom. If you give them the right substrate and hides, they settle in fast. If you do not, they stay stressed, pace, or start testing every gap in your lid.

• Tank size: I would not do one in anything under 75 gallons, and 120+ is a lot more comfortable once you add tankmates.
• Substrate: fine sand, and enough of it. Aim for 4-6 inches so it can actually bury and feel secure.
• Rockwork: build it stable and sitting on the glass or on a bottom plate, then add sand around it. They dig and can undermine piles.
• Hiding spots: PVC elbows or short lengths of larger pipe tucked under rock ledges work great. Give more than one hide so it can choose.
• Flow: moderate. Too much sandstorm and the eel stays cranky and exposed.
• Lighting: they do not need bright light. Dimmer or shaded areas help them act normal.

Water quality needs to be steady. They are messy eaters and the bio-load adds up fast, especially in a sand-heavy tank. A strong skimmer and a sane feeding schedule make your life easier.

• Temperature: 24-26 C (75-79 F)
• Salinity: 1.024-1.026
• pH: 8.0-8.4
• Ammonia and nitrite: 0, always
• Nitrate: keep it low with water changes and filtration (you will notice better appetite and fewer mystery issues)

What to feed them

They are predators. Mine did best on a rotation of meaty marine foods, and it was obvious when the diet was too "thin" (they stayed hungry and prowly). You want chunky, marine-based pieces that smell like real food.

• Staples: pieces of shrimp, squid, clam, mussel, scallop
• Great options: silversides or other marine fish flesh (not every meal, but useful)
• Convenient: quality frozen predator blends if the pieces are big enough
• Avoid as a routine: freshwater feeder fish and fatty freshwater foods (nutrition and parasite risk)

How often? Adults do well with 2-3 solid meals per week. Smaller individuals can eat a bit more often. If it looks like a sausage and breathes heavy after meals, you are overdoing it.

How they behave and who they get along with

Most of the time you will see a head sticking out of the sand, watching. At feeding time they turn into a torpedo. They are not usually out to pick fights, but anything that fits in their mouth is a menu item, and they can surprise you with what they can swallow.

• Good tankmates: larger, sturdy marine fish that do not harass it (bigger wrasses, tangs, rabbitfish, larger angels, some triggers with caution)
• Avoid: small fish, slender fish, and anything that sleeps on the sand (gobies, blennies, small wrasses)
• Also avoid: fin-nippers that will stress it into hiding all the time
• Other eels: risky unless the tank is large and you know exactly what you are mixing. Competition at feeding time gets ugly fast.

Inverts are a toss-up. Snails and crabs can become snacks, and shrimp are basically candy. Corals themselves are usually safe, but this is not a delicate reef fish. It will redecorate by digging.

Breeding tips

Realistically, breeding Philippine snake eels in home aquariums is not something most of us can plan for. Like other eels, they have complex larval stages (leptocephalus) that are very hard to raise. I have never seen a confirmed home-bred report for this species, and I would treat it as a "enjoy the animal" fish rather than a breeding project.

Common problems to watch for

Most issues with these eels come from three things: escapes, bad feeding habits, and stress from an insecure setup. The good news is you can prevent almost all of it with planning.

• Escaping: the #1 cause of loss. Check the lid every time you do maintenance because gaps happen.
• Sand ingestion: feeding on the bare sand can lead to irritation or refusal to eat. Use tongs and a dish/rock feeding spot.
• Refusing food after import: common. Offer smelly foods (clam, shrimp) on tongs at dusk, keep lights low, and do not pester it.
• Injury from rock falls: happens when rock is stacked on sand and they dig under it. Put rock on the bottom first, then sand.
• Parasites and bacterial issues: newly imported predators can bring problems. Quarantine is ideal, but QT for burrowing eels needs sand or PVC and a tight lid.
• Copper sensitivity: like many eel-type fish, they can react badly to copper meds. If you have to treat, research the exact product and consider alternative protocols.

One last practical thing: keep a red flashlight. Checking on it after lights-out tells you a lot. If it is cruising and hunting normally at night, you are probably doing fine even if you do not see it much during the day.