MACI Guides
Practical aquarium guides for understanding what is happening in your aquarium before intervening.
All Guides
Why Your Aquarium Keeps Crashing
If you change water, clean the filter, follow advice, and the aquarium still keeps failing, this guide helps you understand what is really happening.
Cloudy Aquarium Water After a Water Change
Why water can turn white, milky, or cloudy after an intervention, and which mistakes often make it worse.
Fish Keep Dying Even Though Water Tests Fine
What may be happening when water tests look correct, but fish keep getting sick or dying.
Fish Died After Cleaning the Filter
What can happen when the filter is cleaned too deeply and the aquarium biological side is weakened.
Green Aquarium Water Keeps Coming Back
Why it keeps returning, and why it is not always solved only by turning off light or changing water.
Fish Died After a Water Change
Possible causes when fish get worse or die right after a water change.
Easy-to-Maintain Aquarium Without Constant Cleaning
How to design a more living, stable aquarium that depends less on constant rescues.
Cloudy Water After Cleaning Aquarium Gravel
When you may have cleaned too much, and why the bottom of the aquarium is not only dirt.
New Aquarium Fish Dying
What usually fails at the beginning when an aquarium does not yet have enough biological capacity.
Why Your Aquarium Always Has Algae
Why cleaning algae does not always correct the cause that makes them return.
Lighting
What light a living aquarium really needs, when an inexpensive light is enough, and when a higher-quality light can save many problems.
Plants
Easy plants, plant mass, adaptation, and real growth: how to choose plants that are not only decoration, but a functional part of the aquarium.
Substrates
Sand, gravel, nutrient substrate or aquasoil: how to choose a bottom layer that supports the aquarium without turning it into an expensive recipe or a waste trap.