Matthes' synodontis

Where they come from

Matthes' synodontis (Synodontis matthesi) is one of those Tanganyikan Synodontis that surprises people who assume catfish are all "river fish." These guys come from Lake Tanganyika in East Africa - rocky shorelines, lots of cracks and caves, hard alkaline water, and plenty of current and oxygen. That background explains most of what they like in the aquarium.

Setting up their tank

Think "rocky Tanganyika" more than "driftwood Amazon." I have the best luck keeping them in a tank that has real structure: rock piles, caves, and shaded areas where they can hang out during the day. They will use every nook you give them.

• Tank size: I would not do them in anything smaller than a 40 breeder footprint for a single adult, and 55+ is nicer if you want a small group or Tanganyikan cichlid tankmates.
• Substrate: sand is ideal. They root around and sift, and sharp gravel can wear barbels over time.
• Hardscape: stacked rocks and tight caves. Use stable piles (I put rocks on the glass first, then sand around them).
• Filtration and flow: they appreciate clean, well-oxygenated water. A strong canister or HOB plus an extra powerhead works well.
• Lighting: they do not need bright light. If the tank is bright, give them shaded caves or floating plants (if your cichlids allow it).

For water, aim Tanganyika-style: hard, alkaline, stable. I am less worried about chasing a perfect number and more worried about keeping it consistent and clean. They are tougher than people think, but they do not love dirty water or big swings.

What to feed them

They are enthusiastic eaters and will act like little vacuum cleaners, but they are not algae eaters and they are not "cleanup crew" that can live on scraps. Mine do best on a mixed diet with a meaty base.

• Staples: quality sinking pellets or wafers made for catfish/cichlids (higher protein, not just wheat).
• Frozen foods: mysis, brine shrimp, chopped krill, bloodworms as an occasional treat.
• Extras: bits of prawn or white fish once in a while (small pieces, not oily).
• Plant matter: they will nibble, but I treat veggies as optional, not the main course.

They are more active after lights-out. If your cichlids are food-hogs, try feeding the cichlids first, then drop sinking food near the catfish caves a few minutes later. That one change usually fixes "my syno never eats" problems.

How they behave and who they get along with

Matthesi are classic Synodontis: mostly crepuscular/nocturnal, curious, and way bolder once they feel secure. During the day you might only see whiskers sticking out of a crack. At night they cruise.

Temperament-wise, they are not delicate angels, but they are not murder machines either. They will absolutely eat what fits in their mouth. Tiny fry and very small fish are snacks. With similarly sized fish, they are usually fine.

• Good tankmates: Tanganyikan cichlids that are not hyper-aggressive (many rock-dwellers, some sand-sifters), other robust community fish in hard water setups, and other Synodontis of similar size if the tank is roomy.
• Use caution with: very small fish, slow fancy fish, long-finned species that get nipped at night, and super-territorial cichlids that claim every cave.
• Intraspecies: they can be kept singly or in a small group, but give more hiding spots than you think you need. Crowding them with only one or two caves invites bickering.

Breeding tips

Breeding Synodontis matthesi in a typical home aquarium is not something most people stumble into. Some Synodontis species have wild breeding stories (including brood-parasitism with mouthbrooding cichlids), but with matthesi you should assume "possible but not common" unless you are deliberately working on it.

• If you want to try: keep a group, feed heavy with quality foods, and do big water changes with slightly cooler water to mimic seasonal shifts.
• Give them real spawning sites: tight caves and rock crevices they can claim.
• Expect eggs/fry to get eaten in a mixed Tanganyikan tank. A dedicated setup or pulling eggs would be the realistic route.

Common problems to watch for

Most issues I see with these guys come from three things: rough substrate and decor, being outcompeted at feeding time, and water quality slipping because "the catfish will handle it." They will not.

• Worn barbels: usually from sharp gravel, dirty substrate, or constant abrasion on rough decor. Switch to sand and keep the bottom clean.
• Skin scrapes and missing whiskers: tight rocks can pinch them if the pile shifts. Make rockwork stable and avoid narrow "trap" gaps.
• Bloat/constipation: often from too many rich foods and not enough variety. Cut back, offer smaller meals, and vary the diet.
• Ich and stress outbreaks: commonly after a big parameter swing or new fish introduction. Stable hard water and a calm acclimation routine helps a lot.
• Starving in a busy cichlid tank: they are nocturnal and can get bullied off food. Feed after lights-out and place food near their caves.