What Size Tank Does a German Blue Ram Need?
Adult standard length 1.6 inches. About 14 US gallons on a 24 × 12 inch base is enough for a single pair, not a general community.
Full breakdown: how many fish per gallon. Full breakdown: how many fish in a 20 gallon tank.
Shop a 14 gallon aquarium kit on Amazon
Affiliate Affiliate disclosure: as an Amazon Associate, we earn from qualifying purchases — at no cost to you.
The figures
| Figure | Value | Source |
|---|---|---|
| Adult standard length | 1.6 in | Seriously Fish |
| Minimum aquarium base | 24 × 12 in | Seriously Fish |
| Approximate volume | 14 US gallons | Seriously Fish |
| Group / social | Sufficient for a single pair; pristine water; not recommended for a general community | Seriously Fish |
| Filter rating | 110-160 liters per hour, gentle flow | Seriously Fish |
| Filter rating in gallons per hour | 29.06-42.27 gph | Calculated from the published liters per hour ÷ 3.785 (Seriously Fish; 1 US gallon = 3.785 liters) |
| Temperature | 81-86°F | Seriously Fish |
| Heater on the profile | 125-175 watts, assuming a room around 68°F | Seriously Fish |
| Aqueon band that contains about 14 gallons | 50 watts for 5-20 gallons | Aqueon |
| Aqueon 100 watt band | 15-40 gallons (14 is below 15) | Aqueon |
Full breakdown: what size filter for a 20 gallon tank.
How to size it
The floor is the small schooling footprint, and the job of the tank is not a school. Seriously Fish says 24 × 12 inches, about 14 US gallons, is sufficient for a single pair, that the water should be pristine, and that the species is not recommended for a general community. Adult standard length is 1.6 inches. A neon tetra group of 8-10 uses the same base size for a different social plan; do not treat the ram minimum as a community quota.
Four times about 14 gallons is 56 gallons per hour, and five times is 70. The gentle rating converts to 29.06-42.27 gph, well under that band, which is why a sponge filter fits these figures and a 56.80-71.33 gph filter (the neon tetra conversion of 215-270 liters per hour) does not. The betta gentle range is 21.14-33.03 gph, close to this one and still a different rating.
Heat is the other split. The profile lists 81-86°F and 125-175 watts, assuming a room around 68°F. Aqueon puts about 14 gallons only on the 50 watt line (5-20). The 100 watt line starts at 15, and 14 is below 15. A 125 watt species heater is above every Aqueon band that contains this volume. The high temperature is in the source; a corrected wattage is not, so none is calculated here.
Shop a sponge filter on Amazon
Accessory: a 125 watt heater, the bottom of the profile's 125-175 watt span. Aqueon's band for about 14 gallons is 50 watts. Shop a 125 watt aquarium heater on Amazon
Related pages
- Stocking calculator
- What size tank a betta fish needs
- What size tank cherry barbs need
- What size heater a 29 gallon tank needs
FAQ
What size tank does a German blue ram need?
Seriously Fish lists a minimum base of 24 × 12 inches, about 14 US gallons, for Mikrogeophagus ramirezi, and calls that sufficient for a single pair. The profile says the fish needs pristine water and is not recommended for a general community. Adult standard length is 1.6 inches.
What filter flow does a German blue ram need?
Seriously Fish lists 110-160 liters per hour and marks the flow as gentle. Dividing by 3.785 gives 29.06-42.27 gallons per hour. Four times about 14 gallons is 56 gallons per hour, and five times is 70, so the gentle rating is lower than ordinary turnover.
What heater does the ram profile list for about 14 gallons?
Seriously Fish lists 81-86°F and a 125-175 watt heater, assuming a room around 68°F. Aqueon lists 50 watts for 5-20 gallons, which includes about 14 gallons. The 100 watt band starts at 15 gallons.
Sources
- Seriously Fish, Mikrogeophagus ramirezi. https://www.seriouslyfish.com/species/mikrogeophagus-ramirezi/. Accessed Oct 2, 2026.
- Aqueon, Heater Wattage Guidelines. https://www.aqueon.com/-/media/project/oneweb/aqueon/files/us/educational/aq_heater_wattage_chart.pdf. Accessed Oct 2, 2026.