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Trewavas' Petrochromis (Petrochromis trewavasae)
23–25°C · pH 7.5–8.5
£97.99
A rock-grazing Lake Tanganyika goby cichlid for hard, alkaline aquariums with excellent oxygenation and stable water.
CichlidsDisplay FishFishFreshwater FishModerate CareTropical FishUK Delivery
Care at a Glance
Scientific Name
Eretmodus cyanostictus
Max Adult Size
up to 8 cm
Lifespan
8 years
Care Level
Moderate
Temperament
Semi-aggressive
Temperature
24–27°C
pH Range
7.8–9
Hardness
10–25 dGH
Minimum Tank
80L
Diet
Spirulina, algae-based foods, small frozen foods
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Water Parameters
Temperature
24–27°C
24°CIdeal27°C
pH Level
7.8–9
7.8Ideal9
Water Hardness
10–25 dGH
10 dGHIdeal25 dGH
Eretmodus cyanostictus
Kasanga Goby Cichlid (Eretmodus cyanostictus)
Moderate Care
Semi-Aggressive
£62.99Sold Out
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— save up to 20%Save when buying multiple fish. Each quantity is one fish; sex and pair formation are not guaranteed unless the selected variant explicitly states them.
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Live arrival guaranteed. If they don’t arrive healthy, email us a short unboxing video the same day for a replacement or refund. Packed in oxygenated bags with insulation and heat packs when needed.
£19.95 tracked delivery — half price (£9.98) from £100.00, free from £200.00. One delivery charge however many fish you add — everything travels together with a licensed live-animal courier.
Read our reviews on Google (opens Google Business Profile in a new tab) or see verified buyer reviews and photos. Human support, careful packing and clear delivery updates for live aquatics.
A rock-grazing Lake Tanganyika goby cichlid for hard, alkaline aquariums with excellent oxygenation and stable water.
CichlidsDisplay FishFishFreshwater FishModerate CareTropical FishUK Delivery
Care at a Glance
Scientific Name
Eretmodus cyanostictus
Max Adult Size
up to 8 cm
Lifespan
8 years
Care Level
Moderate
Temperament
Semi-aggressive
Temperature
24–27°C
pH Range
7.8–9
Hardness
10–25 dGH
Minimum Tank
80L
Diet
Spirulina, algae-based foods, small frozen foods
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size above for the actual shipping size. Product-photo provenance and any image-specific limitations are stated on the listing.
Full Care Guide
Cichlids: Types, Care & Tank Planning
Cichlids are a family of roughly 1,800 accepted species, not one care type. Before buying, identify the exact species and source, then compare adult measurement, usable tank dimensions, social system, territory, tested water, diet and an exit plan. No family-wide minimum tank, water range or tank-mate list is safe.
14 min readRead guide
Water Parameters
Maintain these water conditions for optimal health and vibrant colors
Temperature
24–27°C
24°CIdeal27°C
pH Level
7.8–9
7.8Ideal9
Water Hardness
10–25 dGH
10 dGHIdeal25 dGH
Kasanga Goby Cichlid overview
Kasanga Goby Cichlid (Eretmodus cyanostictus Kasanga) is a Lake Tanganyika goby cichlid for hard, alkaline rockwork aquariums. It grazes algae and aufwuchs, perches over stones, and needs excellent oxygenation and stable water quality.
Quick facts
| Sale size | 5-6 cm on this variant; smaller sizes may appear on the parent listing |
|---|---|
| Adult size | About 8-9 cm |
| Minimum aquarium | 90 litres or more, with a strong footprint and rockwork |
| Water | 24-27°C, pH 7.8-9.0, hard alkaline water |
| Diet | Spirulina and algae-led foods; avoid heavy rich protein feeding |
Care notes
Build the aquarium around rounded rocks, open sand, strong biological filtration and high oxygen. Goby cichlids can be territorial with similar fish, so plan pairs and groups carefully.
Ordering from Tropical Fish Co
Livestock is packed for delivery by a licensed live-animal courier and covered by our Live Arrival Guarantee when the policy conditions are followed.
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What customers say about ordering from us
4.6 on Google Maps, rated 4.6 out of 5 (opens in a new tab)4.4 · 91 shop reviews read them, rated 4.4 out of 5
- 4 out of 5Verified buyer
I have a small group of long finned mountain minnows. So was delighted to be able to order ten of this variety to increase the genetics in my tank . The ones I recieved are healthy but it’s to early to give a verdict on wether they are of a long finned type since they are small currently.
Gordon Walker · 23 Sept 2026
- 5 out of 5Verified buyer
100% success travel and "installation". Pleased with quality of purchase. The Siamese fighter a bit "shy" so have not yet seen him at his best yet but looking good. Happy customer. GG
George E Garratt · 21 Sept 2026
Reviews of our shop, collected by Judge.me, an independent third-party review collector. Newest first.