By William Berg
of Sweden, for his website: www.aquaticcommunity.com
Scientific Name: Botia macracanthus
Other Scientific Name(s): Cobitis macracanthus, Botia macrocanthus
Common Name: Clown Loach
Clown loaches are very popular aquarium fish; however they are not always easy to keep
successfully since they easily succumb to ick and are sensitive to poor water conditions.
This article is intended to help new clown loach owners provide a good home for their
loaches. Clown loaches are found in Indonesia (Sumatra and Borneo), and almost all clown
loaches in aquariums are wild caught and distributed around the world before being sold.
This can put considerable stress on the fish, and a vital step in getting a healthy clown
loach school in your aquarium is choosing healthy fish. But how to make sure that you get
- Check the general conditions in the fish store. Are there dead fish in the
aquariums? Is the water clean? If some tanks are mistreated there is a good chance that
there might be unfavourable conditions in others too. Only buy fish from stores that take
good care of their aquariums.
- How do the clown loaches look? Clown loaches can give you an indication of their
condition based on their coloration. A healthy clown loach shows clear distinct colours,
while a stressed one loses its colours and becomes whiter. Only buy loaches that show
their correct colours.
- Are the clown loaches well fed? Those that haven't been fed correctly are hard to
nurse back to health, and it is more than likely you will end up with a dead fish if you
buy one. Look at their bodies and see if they look well fed, and ask the shopkeepers how
often and what the loaches are fed.
- Are the clown loaches active? Healthy clown loaches are very active and full of
energy. A healthy clown loach should be hard to catch.
- Do the clown loaches have hiding places? Hiding places are very important to
relieve stress in clown loaches, and you are likely to get higher quality fish from
aquariums with hiding places.
- Don't buy clown loaches smaller than 2 inches/5 cm if you haven't kept clown
loaches before, since they are much more sensitive when they are younger.
So ideally you should look for the most coloured, most active clown loaches you can
find, and buy these to have the best starting point possible. You should also consider the
water conditions in the store and try to find one that keeps their clown loaches in water
condition similar to the water conditions in your aquarium, to reduce stress on the clown
loaches. It should also be stated that clown loaches like resting on their sides, looking
almost as if they were dead. However this is completely normal and should not be seen as a
sign of poor quality in the fish but rather the opposite. When you have decided where to
buy your clown loaches you should buy at least 3 (preferable 8-10). Clown loaches are
schooling fish that should never be kept alone!!!
Once you get home with your new clown loaches you should let the bag float on the water
surface for 10-15 minutes, and then slowly every 10 minutes add a little water from the
aquarium (a coffee cup). Repeat this 4-5 times before you release the fish into their new
Clown loaches can be kept in aquariums of 100 L / 20 G or more. Keep in mind that even
though clown loaches grow very slowly they will get big eventually and need an aquarium of
at least 540 L/ 125 G, and that should be considered a minimum.
Decorate your aquarium using a bottom substrate of sand or fine gravel that allows the
clown loaches to dig . I recommend keeping your clown loaches in a planted aquarium,
however the choice of plants differs greatly depending on whether you keep juvenile or
adult clown loaches. Juvenile clown loaches can be kept with most plant species, while
adults can be kept only with hardy plants such as Java fern and Anubias. All other plants
will be destroyed and/or eaten by the adult clown loaches. I also recommend using floating
plants to dim the lighting, which makes the loaches more active during the day.
Clown loaches want a setup with a lot of caves and other hiding places, preferably so
narrow that they can just barely squeeze themselves into them. Don't be concerned if your
clown loaches have squeezed themselves into caves they dug under rocks or aquarium
equipment. Odds are they are not stuck - they just like it that way.
Hiding places can be created with rocks, roots, PVC pipes, flower pots, coconuts and
different kinds of aquarium decorations. Sharp objects should not be used to decorate
aquariums for clown loaches. You can not create too many hiding places and you should
create several for each loach.
Clown loaches are sensitive to poor water quality, and they require good filtration.
Higher water circulation is also appreciated since clown loaches live in currents in the
Clown loaches are excellent jumpers, and you should make sure that your tank is
As I said earlier, clown loaches are very sensitive towards poor water quality and are
usually the first fish that get ill or die if the water quality drops. Water changes of at
least 25% a week are recommended. Because of their low tolerance to poor water qualities
they are sometimes called indicator fish, since their health indicates the status of the
aquarium. Clown loaches are very sensitive to chlorine, and even small amounts can cause a
mass death of loaches.
This species are very prone towards getting ick if the water quality isn't good enough,
and are sensitive to most ick medicines and salts. So keep an eye on your clown loaches
and only use half the recommended doses of medicine, otherwise you risk the medicine
killing the loaches.
Clown loaches are carnivores and only eat vegetables to complement their diet. It is
therefore recommended that they are given food that reflects this. To get your clown
loaches to grow, optimal feeding 3-5 times a day is recommended. (They still grow slowly).
Their diet should contain a variety of foods, and can include almost any carnivorous food.
A good base may be shrimps, different sinking wafers, different frozen foods, and as they
grow older, fish slices. Clown loaches can make a clicking sound, and they will do this
when they are content. Therefore you will soon find out what is your loaches' favourite
food by them clicking when they receive it. Like most other fish, clown loaches might need
some time to accept new foods, however once they do it might become a favourite. Clown
loaches are one of the few fishes that eat and like snails, and can therefore be of good
use in snail control.
Clown loaches have been bred in aquariums, however it is very rare. Sexing clown loaches
externally is hard, but possible by looking at the tail fin. The tail fin tips on the male
are slightly bent inwards, making the fin look a little bit like a claw. The tail fin tips
on the females aren't shaped like this.
Clown loaches have to be quite old and at least 7 inches / 17 cm before they are
sexually mature. In the one good account of clown loaches spawning they spawned under the
- Temp: 84F
- pH: 6.5
- Ammonia & Nitrite: 0
- Nitrate: < 25
Four large clown loaches (over 25 cm /10 inches) were kept together in a planted
aquarium, and a few weeks before spawning they changed their behaviour and started eating
live fish as their only accepted food. The females in the group grew very fast on this
diet, and had doubled in girth by the time of spawning. The night during which the
spawning took place, two clowns were swimming close beneath the surface entwined in each
other and "clicking." The next morning, 450 eggs were found spread about the
aquarium. Clown loaches eat their own eggs, so it is recommended moving the parents if you
wish to succeed in spawning them.
The fry were fed liquid fry food for the first two weeks, after which they accepted
crushed flakes. They grew relatively fast, to 2.5 cm/ 1 inch in 6 weeks. After that the
growth rate slowed down.
It's suggested that older fish are essential for breeding since this fish might have to
be quite old to be sexually mature. Clown loaches live to be about 50 years, so it is
quite feasible that they may spawn later in life than many other species.