The most unpretentious aquarium fish - those that live in good, kind and caring hands. This is an axiom. If you violate the rules of care, everyone will die in your mini-sea. Therefore, you should not consider the underwater fraternity exclusively as whimsical or not. It is important to create suitable conditions for the fish, and only starting from this, consider their endurance.
Catfish
They top the list of those participating in the nomination. "The most unpretentious aquarium fish." Any of the subspecies is a wonderful "gardener". Not only will they look after your plants and clean the glass of the aquarium, these fish are also very undemanding. They calmly tolerate temperature differences and dirty water. The only negative is that they hide all the time, but they will become wonderful neighbors for any kind of fish. Water aeration is not required for all subspecies of this genus, but it is advisable not to refuse this aquarium device.
Guppy
Just a couple of decades ago, to the question of which aquarium fish are unpretentious, you would get an answer - guppies. But now things are a little different. A huge number of breeding forms have appeared on the market that need high quality water, which will be difficult for a beginner aquarist to provide. If you manage to get wild animals, then you are in luck.
Sumatran barbs
These striped pirates are very cheerful, fans of fight and bite tails to someone. Withstand any (within reason) temperature fluctuations and water quality. A small (20-30 liters) aquarium with a filter, heater and aeration will be an excellent home for a small flock.
Angelfish
Slow beauties, stiffly posing by the glass, are also included in the list of "The most unpretentious aquarium fish." They withstand seasonal changes in water temperature, but require an aquarium of large volumes (from 50 liters) with filtration and aeration.
Danio
Funny, tireless small fishes. They love outdoor games and high jumps. Stock up on a large (from 30 liters), bright aquarium with a lid, which must be equipped with an aerator, filter and heater. A flock of little thieves will tirelessly delight you with their pirouettes and games.
Cockerels
Perhaps these are the most unpretentious aquarium fish, those who need a minimal set that supports the necessary conditions for living: only an aquarium. A small (3-4 liters), standing in a bright room, is ideal for them. The only negative of these fish is their aggressive nature. They need stagnant warm (+ 22-26 ° C) water. Weekly replacement of a third of the volume of the aquarium is required.
Based on the above information, you can draw conclusions and solve the question of which aquarium fish are the most unpretentious for you. And in conclusion, we want to recall that the feed, or rather, its volume, plays an important role. Fish do not know the measure, and will eat until they burst (in the literal sense of the word). Hungry fish is a healthy fish!