40L NPS tank at night

35 cm cube AIO NPS dominated. Corals are fed with BBS twice a week, + occasional spot feeding with Two Little Fishies Nutrigorg. https://www.youtube.com/shorts/g-RhY7t7_H4

Aquarium Profile and Equipment

What type of saltwater aquarium is this?: NPS Reef

Total Water Volume: 12

When did you start this tank?: Jul 1, 2026

What is your aquarium made of?: Glass

Aquarium Length (inches): 13.78

Aquarium Width (inches): 13.78

Aquarium Height (inches): 13.78

Aquarium Overflow/Drain: All In One Tank

Aquarium Sump: NO Sump

Aquarium Controller: NO

Protein Skimmer: YES

Aquarium Reactors

None

What types of equipment are you using for water flow and circulation?

None

Aquarium Lighting

Auto Top Off or ATO: YES

Aquarium Heating and Cooling

Neither

Water Temperature: 77

Aquarium Water Chemistry and Parameters

Specific Gravity: 1.025

Nitrate or NO3: 15 PPM

Aquarium Natural and Mechanical Filtration

Substrate: Sand

Substrate Level: Deep

Nutrient Export

Filter Sock

Water Changes: YES

Water Change Details: 25%, once a month.

Nutrient Export Details: Nitrate levels tend to stay on the low side for an NPS reef (10-20 ppm). This is likely due to (1) the light bioload—one pipefish and two snails—(2) feeding mainly live Artemia nauplii, and (3) Caulerpa (which I found to be a voracious consumer of nitrate).

Aquarium Tank Inhabitants (fish, coral, invert etc.)

Fish List

Pipefish

Total Fish: 1

Coral List

NPS Coral

Total Corals: 16

Invert List

Snails

Livestock Detail: This is a 40 L, NPS-focused reef. Fish & inverts include a banded pipefish, two turban snails, a feather duster worm, and sea squirts. The coral collection includes several NPS gorgonians & sea whips (not sure of the exact species, but quite common in East Asia), Purple Dendronephthya, Paraminabea rubeusa, Koji Wada Pink Nepthea, another Nephthea/Litophyton soft coral, and two fathead Dendrophyllia colonies. Caulerpa macroalgae can be seen in the back, which is a great for nutrient export.