Blue Neon Goby
Stiphodon atropurpureus
Gobiidae
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About
A male blue neon goby is a grey fish carrying one metallic blue-green line from snout to tail, and that line is the whole reason the species sells; on a dominant or breeding male it turns almost white. The female shipped in the same bag looks like a different animal — much paler, with a dark zig-zag stripe along the side. Names are a mess across this genus and this species has more than its share. It turns up on sale as S. elegans, as 'Sumatran blue neon goby' (it is not found on Sumatra), as 'cobalt blue goby' and as 'freshwater neon goby', and other species get sold under its name in return. The check that works on a shop fish is the blue lateral stripe together with a reddish outer edge to the first dorsal fin — a combination no other member of the genus has. Where it comes from explains the care. The type specimens were Philippine, from Luzon and Mindanao; that series was destroyed in the Second World War and a neotype was designated from Leyte in 1995. The species is now recognised from the islands of southern Japan, Taiwan, the southern Chinese coast including Hong Kong, the Philippines, and Tioman Island off south-eastern Peninsular Malaysia. Its habitat is the steep end of a short coastal stream: it belongs to the group with a low, rounded first dorsal fin that climbs waterfalls, and it lives high up, in fast narrow runs and riffles broken by wider slower stretches, usually above a waterfall or cataract. Clear, brightly lit, oxygen-saturated water over stone furred with biofilm — that is the entire specification. And it cannot be bred in a tank. Stiphodon are amphidromous: adults spawn in fresh water, the larvae hatch undeveloped and wash down to the sea, they drift as plankton for 78 to 146 days, and only then do the juveniles climb back up the river. Nobody has yet raised fry of any Stiphodon in captivity. Every one on sale is therefore wild-caught, and that has consequences the buyer should own: the species is considered to be of conservation concern in subtropical Asia, dams and culverts cut the migration route it depends on, and collection by aquarium hobbyists — private and commercial alike — is named as a serious threat to the genus in some regions.
Care
Mature tank, strong light, real flow, and no compromises on any of the three. These fish need stable water and eat biofilm, so they must never go into an immature set-up, and a tightly fitting cover is required because they climb glass. Temperature 22–26 °C — narrower than most of the genus, with extra surface agitation at the top end — pH 6.5–7.5, hardness 36–215 ppm. Flow is a number here, not a mood: 10–15 tank volumes an hour is the recommendation, and 5–10 is workable if oxygenation is good. Light hard enough to grow algae, then let the algae grow on everything except the front glass; 30–50 % weekly water changes keep the water clean without keeping the rocks clean. Floor of sand, gravel or both under water-worn stones, with the large rocks seated directly on the tank base, because males burrow into the substrate to sleep and to spawn. A 60 × 30 cm base is enough for a pair or small group, and bigger if you want more than one Stiphodon species in there, since males are territorial; the recommended purchase is one male with two or more females. Tankmates: Tanichthys, Microdevario and small danios above, Gastromyzon and similar hillstream loaches below, dwarf shrimp are fine. Avoid greedy feeders such as most Schistura, avoid other algae eaters that will out-graze it, and leave cichlids out entirely. Do not buy a thin, hollow-headed specimen out of pity without a quiet tank to nurse it in — and know before paying that the fish came out of a wild stream.
Diet
Specialised biofilm and algae grazer: benthic algae, diatoms and the micro-organisms in them, rasped off rock with extrusible, regenerating teeth. Sinking dried food and frozen bloodworm only irregularly. A spotless new tank starves it.
Tankmate compatibility
Gets along with (102)
Possible with care (250)
Avoid (66)
Computed by the AquaSage engine for a spacious reference tank — always check the full verdict for your exact setup in the calculator.
Telling males from females
What works for this species, most reliable first.
- Colour and patternA hint only · from about 6 months, and only on a settled fish
In rainbowfish, killifish and several barbs the male carries the colour — deeper and more saturated, intensifying further when he displays.
Also in these lists
Similar species
Same category and the closest water parameters — if this species isn't quite it, start here.
Sold in Lithuania
These Lithuanian shops listed this species in their public catalogue (checked August 8, 2026). Stock moves — ask before you travel.
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Frequently asked questions
- What tank size does a Blue Neon Goby need?
- A Blue Neon Goby needs an aquarium of at least 60 litres (15.9 US gallons) with a footprint at least 60 cm (23.6 in) long — for this species, swimming length matters as much as raw volume.
- What water parameters does a Blue Neon Goby need?
- Blue Neon Goby does best at 22–26 °C (71.6–78.8 °F), pH 6.5–7.5 and a general hardness of 2–12 °dGH.
- What group size does a Blue Neon Goby need?
- Blue Neon Goby is a social species — keep a group of at least 3 so natural behaviour emerges and stress stays low.
- Is the Blue Neon Goby suitable for beginners?
- Blue Neon Goby is a demanding species best attempted with some experience — it needs stable, closely watched conditions to thrive.