Bluespotted dottyback

Where they come from

Bluespotted dottybacks (Pseudochromis persicus) come from the northwest Indian Ocean region around the Persian Gulf and nearby waters. In the wild they live in and around rocky reefs, rubble, and little caves - basically places where they can duck into cover fast and keep an eye on a small patch of territory.

That background explains most of their personality in a tank: bold, always watching, and very attached to a favorite hole in the rockwork.

Setting up their tank

Think "rockwork first" with this fish. If you give them a few tight caves and crevices, they settle in quicker and you will see them out more often. A bare scape tends to make them extra jumpy and extra bossy.

• Tank size: I would start at 30 gallons for a single fish. Bigger makes tankmate choices way easier.
• Rockwork: build multiple hiding spots so other fish can get away from them.
• Flow and oxygen: moderate flow is fine. They do like clean, well-oxygenated water like most reef fish.
• Cover: use a lid or mesh top. Dottybacks can and do jump, especially right after you add them or during chasing.

They are reef-safe with corals, and they do fine in a typical reef temperature and salinity range. Stability matters more than chasing a magic number. Keep ammonia and nitrite at zero, keep nitrate reasonable, and do regular water changes and you are in the ballpark.

What to feed them

These guys are little predators. In my tanks they were not picky once settled, but they hit that "new fish quarantine" stage where they test you for a couple days. Start with foods that move or smell strong, then broaden the menu.

• Frozen mysis is usually the easiest win.
• Enriched brine shrimp works as a starter, but I would not make it the main diet.
• Chopped krill, clam, or squid for variety (small pieces, they have small mouths).
• Quality marine pellets once they recognize it as food.

If you keep tiny ornamental shrimp (sexy shrimp, small peppermint juveniles, etc.), be careful. Many dottybacks treat them like snacks, and P. persicus is no exception.

How they behave and who they get along with

Bluespotted dottybacks are confident and territorial. They are not "monster fish" aggressive, but they will absolutely pick on timid tankmates, especially in smaller tanks or tight rock layouts.

• Good tankmates: other semi-bold fish like many wrasses, dwarf angels, larger gobies, foxface, tangs (in appropriate tank sizes), and most clownfish.
• Risky tankmates: very shy fish (firefish), tiny gobies, small assessors, and anything that likes to hover in the same cave zone.
• Inverts: larger cleaner shrimp often do fine, but small shrimp can disappear. Small crabs and tiny snails can also get harassed.

Order of addition matters. If you add the dottyback early, it tends to act like it owns the whole reef. Add it later, after more peaceful fish have claimed their spots, and it usually settles into one corner and stays there.

Breeding tips

They are egg layers and will spawn in a cave if you get a bonded pair, but raising the babies is the hard part. The male guards the eggs, and you will see him glued to the nest fanning them.

• Give them a tight cave or a short length of PVC tucked into the rock. They love a "doorway" they can defend.
• Feed heavier with meaty foods leading up to spawning attempts.
• If you want to try rearing larvae, you will need a separate larval setup and tiny live foods (rotifers first, then larger as they grow).

Common problems to watch for

• Bullying: nipped fins and fish hiding all day is your early warning. Add more rock cover, use an acclimation box, or be ready to rehome the dottyback if the tank is small.
• Jumping: especially right after introduction or during a territory dispute. A lid saves lives.
• Shrimp and microfauna predation: they may hunt small shrimp and pick at tiny cleanup crew members.
• New fish stress and not eating: they can sulk for a couple days. Offer frozen mysis and keep the lights a bit lower at first.
• Marine ich/velvet risk: dottybacks are not immune. Quarantine and observation pays off, because treating a reef display is a headache.

Once they are settled, they are tough little fish and a lot of fun - tons of personality packed into a small body. Just set boundaries with rockwork, pick tankmates that can handle a bit of swagger, and you will usually have a great experience with them.