Spirulina Flake Food Comparison Guide: Herbivore Nutrition
Spirulina is a freshwater blue-green algae, Arthrospira platensis, farmed for its unusually high protein content, digestible cell walls and carotenoid pigments. Commercial spirulina flake foods have become the backbone of herbivore feeding for mbuna, silver dollars, mollies, otocinclus and tropheus. This spirulina flake food comparison guide from Gensou Aquascaping at 5 Everton Park benchmarks the major brands sold in Singapore, explains what the pigments actually do, and helps you pick a flake worth its $2 per 10 g price tag.
Quick Facts
- Spirulina protein content: 55-70 per cent dry weight
- Beta-carotene: 1.5-2 mg per gram, zeaxanthin 1-2 mg per gram
- Typical inclusion in commercial flakes: 20-40 per cent spirulina
- Key brands in Singapore: Hikari, Ocean Nutrition, Omega One, Sera, Tetra
- Target species: herbivores, omnivores needing colour, marine tangs
- Feeding rate: once or twice daily as part of rotation, not sole diet
- Price range: $4-12 per 50 g tub at local shops
Why Herbivores Need Spirulina
Fish such as mbuna from Lake Malawi and tropheus from Lake Tanganyika evolved grazing on algal biofilm called aufwuchs. Their gut is long, adapted to fermenting plant matter, and loaded with high-protein animal foods like bloodworm it produces Malawi bloat, a fatal intestinal inflammation. Spirulina slots into that niche because it is plant-like in fibre profile but high in usable protein. The same logic applies to mollies, silver dollars and many marine surgeonfish.
What the Pigments Do
Spirulina is rich in beta-carotene, zeaxanthin and phycocyanin. Beta-carotene converts to yellow-orange pigmentation, zeaxanthin deposits as yellow, and phycocyanin is the blue protein-pigment complex. Fish cannot synthesise these from nothing; they incorporate them from diet. Expect visible colour enhancement in mbuna yellows, platies, mollies and goldfish within four to eight weeks on a spirulina-forward feed. The effect is real but not instant.
Hikari Spirulina
Hikari Spirulina Flake has been a shelf-standard in Singapore for two decades. It runs 30-35 per cent spirulina by the guaranteed analysis, with crude protein 47 per cent and fat 3 per cent. Flakes are thin, soften quickly without complete disintegration, and leave minimal oil slick. It works well for community tanks and smaller cichlids. Expect $6-9 per 30 g tub at Thomson Road shops.
Ocean Nutrition Formula Two
Ocean Nutrition’s herbivore flake, Formula Two, is built around spirulina at 30 per cent plus kelp, chlorella and garlic. Protein 45 per cent, fat 4-5 per cent, fibre 3 per cent. It is the common recommendation for marine tangs and also works for mbuna. The flake is thicker than Hikari’s, holds together longer at the surface, which is useful for species that graze rather than rush food. Singapore pricing $10-14 per 70 g.
Omega One Veggie
Omega One Veggie Flake leads with whole kelp and whole spirulina rather than meal concentrates. Protein 42 per cent, fat 11 per cent (high, largely omega-3), ash 8 per cent. The colour-enhancing effect is noticeably strong on orange and red community fish. Availability in Singapore is patchy; Shopee sellers carry the 62 g tub at $9-12. Best stored in an airtight container with a silica sachet because the flakes are oil-rich and go rancid faster than grain-heavy competitors.
Sera Spirulina Tabs
Sera Spirulina Tabs are a different format but share the spirulina theme. These adhesive tablets stick to the tank glass and let plecos, otocinclus and shrimp graze slowly over hours. Spirulina content roughly 20 per cent, the rest wheat germ, fish meal and vegetable ingredients. Cheap relative to premium flake, about $8 per tub of 100 tabs. A useful second food for shrimp tanks where flake food gets missed by the adults and wasted.
Tetra Pro Vegetable
Tetra Pro Vegetable Crisps use a baking process that retains more nutrients than extrusion, with spirulina featuring among the top five ingredients. Crisps are larger than flakes, sink slightly over 30 seconds, and suit mid-water feeders. Availability is excellent in Singapore through NTUC and Pets Lovers Centre. Pricing $8-11 per 55 g.
DIY Spirulina Gel Food
Many serious mbuna and goldfish keepers in Singapore make their own gel food. Base recipe: 4 g powdered spirulina, 8 g unflavoured gelatine, 100 ml warm water, blended and poured into silicone moulds. Cost works out at about $1.50 per 100 g compared to $12-18 commercial. The downside is refrigeration is mandatory and batches last 10 days. Powdered spirulina is sold at Mustafa Centre and health shops at roughly $25 per 200 g of human-grade powder.
Rotation and Feeding Rate
Spirulina flake is not a complete diet even for strict herbivores. Rotate with a protein-moderate pellet and occasional blanched vegetables such as spinach, courgette or kai lan. Feed what the fish can clear in 30-60 seconds, once or twice a day. Uneaten flake is the most common source of nitrate creep in Singapore community tanks, since humidity accelerates microbial breakdown of missed food at the substrate.
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