Bob Ward's bluespotted maskray

Where they come from

Bob Ward's bluespotted maskray (Neotrygon bobwardi) is an Indo-Pacific coastal ray. Think sandy lagoons and rubble flats where it can half-bury itself and pounce on little crustaceans. They are not a "reef slope" animal - they live life on the bottom, in warm, stable saltwater.

Setting up their tank

This is one of those fish where the tank is the whole game. A ray can look fine in a too-small setup... right up until it doesn't. You want footprint, not height. Long and wide beats tall every time.

• Tank size: plan on a very large, wide tank or indoor pond style setup. For most home aquariums, "bigger than you think" is the rule. A wide 8 ft footprint is the kind of territory that makes life easier.
• Footprint over rockwork: leave big open sand zones so it can cruise and settle. Keep rock structures tight and stable so nothing can topple when the ray bulldozes around.
• Sand: fine, smooth sand. No crushed coral, no sharp grains. Rays rub their bellies and edges constantly.
• Flow and oxygen: strong gas exchange and steady circulation, but avoid a blasting jet aimed at the sand where it rests.
• Filtration: oversized and simple. These guys are messy eaters and produce a lot of waste. Expect to run big skimming and serious biological capacity.
• Water: stable marine parameters, steady salinity, and low nitrogen waste. Rays do not like "new tank vibes" at all.

Make the tank ray-proof. Cover intakes, overflows, and any gap it can wedge into. I have seen rays scrape themselves on overflow teeth and come out looking like they lost a fight.

What to feed them

A healthy maskray eats like a little vacuum cleaner with opinions. They are built for meaty foods from the bottom, and they do best when you feed with intention instead of just tossing food in and hoping it finds it.

• Staples: shrimp, squid, scallop, clam, marine fish flesh (in moderation), and quality frozen crustacean mixes.
• Good extras: live blackworms (if you can get clean ones) can jump-start picky new arrivals; enriched mysis can help at the beginning but is usually too small long term.
• Avoid: freshwater feeder fish, goldfish, and anything oily/dirty. Also avoid spiky shell-on foods that can irritate the mouth if it is not used to them.
• Supplements: rotating foods plus occasional vitamin soak helps, especially for new rays or ones recovering from shipping.

Target feeding is your friend. Use long tongs or a feeding stick and place pieces right in front of the ray. Once it learns the routine, it will come to the same spot and eat calmly instead of scavenging and getting bullied.

How they behave and who they get along with

They are generally peaceful, but they are not "community safe" in the way people mean it. They are a predator that happens to ignore a lot of fish. Anything small enough to be pinned can become dinner, especially at night.

• Good tankmates: larger, calm fish that will not nip (some tangs, larger wrasses that are not aggressive pickers, certain angels with caution).
• Bad tankmates: fin nippers, boisterous triggers, most puffers, many large wrasses that like to mess with bottom dwellers, and anything that will compete hard at feeding time.
• Also risky: aggressive sharks/rays mixed together in tight quarters. They can stress each other out and food competition gets ugly fast.

Expect a lot of "sand rearranging". They will bury, fan sand, and leave trails. Corals and delicate rock-on-sand arrangements do not love this. If you try it in a reef, accept that it will be a sandstorm sometimes.

Breeding tips

Breeding rays in home aquariums is rare mostly because of space and the challenge of keeping a mature pair long term. Neotrygon are generally livebearers (aplacental viviparity), so the female carries pups and gives birth to fully formed little rays.

• If you ever try: start with a large, stable system and multiple juveniles so a pair can form naturally.
• Feed heavy and varied: conditioning is basically "keep them fat and stress-free" without trashing water quality.
• Give privacy: lots of open sand with quiet zones. Chasing and courtship can be rough in tight tanks.
• Be ready for pups: they need tiny meaty foods and a safe environment away from hungry tankmates.

Common problems to watch for

Most issues with maskrays come down to three things: shipping damage, poor substrate/tank layout, and not getting enough food into them consistently.

• Refusing food: common right after arrival. Try smaller pieces, different scents (squid vs shrimp), and dim feeding. If it still will not eat after several days, look hard at stressors and water quality.
• Mouth injuries: they can happen from bad substrate, grabbing sharp food, or slamming into rockwork. Keep sand fine and feed soft pieces at first.
• Belly and edge abrasions: usually from rough sand, exposed rock, or getting pinned against intake guards. Fix the environment, not just the symptoms.
• Parasites: flukes and internal parasites can show up as weight loss despite eating, or heavy breathing. Treating rays is a specialist game - avoid copper and research ray-safe options first.
• Water quality sensitivity: ammonia and nitrite should be zero, and nitrate kept low. Rays go downhill fast in "slightly dirty" systems compared to many fish.
• Stress from tankmates: stealing food, nipping, or constant cruising pressure. If the ray hides all the time or stops feeding, assume social stress until proven otherwise.

If you want to succeed with this species, treat it like a big, sensitive bottom predator that needs space and routine. Once it settles and you have a feeding rhythm, they can be surprisingly hardy - but they do not forgive sloppy setups.