My fabulous 20 yr old aquarium

Father Fish
41 followers
Oct 10, 2026
This 40 gallon long tank is not filtered and does not receive water changes. Fish are fed once weekly in small amounts. There has never been a sick fish in this aquarium.
Well, good morning. This is Father Fish again,
and today we're looking at a 20-year-old
aquarium. This tank was set up in 1998.
It's a little more than 20 years old.
In that amount of time,
the substrate on the bottom has never been changed.
about 10 years ago I added to it put about an inch
of sand in it some of the plants are original
but it produces plants at such a prodigious rate
that I use it as a mother tank and I pull plants
from it to set up my other aquariums.
It has no filtration and no aeration.
It has a glass top
that pretty well controls evaporation,
so it gets very little water replacement. It's an old
water tank with a two and a half to three inch
substrate that's primarily soil, or at least it
was. It's been there so long now that it has created
its own soil. The fish that are living
in it are a combination of several kinds of animals
and they change from time to time.
Currently I have some Tanganyika shell dwellers,
about three pair. I have at least a trio
of Praecox, and a pair of buffalo heads.
There also are some cherry barbs
and a few other tetras
swimming around to add color and action.
There are a few plecostomus, one or two otocinclus.
All in all, there are probably 30
to 35 fish in this 40-gallon long.
It could hold many more.
I could easily have 100 small fish in it,
like 100 tetras, or even more.
I feed the tank two to three times
a week with this number of fish.
And they get exclusively live food.
That is, they get worms, black worms, or daphnia.
I don't feed much of anything else because they really don't want
to put food in there that's going to deteriorate.
It will be alive until it's eaten.
And then when it's eaten, I'm confident that the nitrification,
the nitrate production in this aquarium is sufficiently
powerful to be able to deal with whatever waste is created.
I also have a number of variety of fish,
so the uneaten weight or undigested
waste will not go to waste,
but will be eaten by some of the other fish in the
aquarium. What I want this aquarium
to demonstrate, especially to the beginners,
is that you really can set up
a tank for the first time
that will last virtually a lifetime.
It can be stable and solid and dependable,
something you can work on to beautify,
something you can have a variety of different kinds of fish living in
that will give you a wholesome healthy happy environment
for fish for as long
as the tank remains.
Now to accomplish this there are a few basic things you
need to do. For one thing you need
to start with good hard alkaline water. Do
Do not use spring water.
Do not use reverse osmosis water unless you use
the waste from the RO system, and that
will generally be perfect.
Do not use rainwater.
All of those are very soft.
They contain virtually no minerals.
two important demands for minerals
in the aquarium. One is the plants. The
plants require minerals and especially
iron in order to be able to grow. The
The other is the pH.
In order to maintain a pH of 7.5 to 8.0,
you need carbonates.
The biological activity involved
in any aquarium will eventually drive down the pH.
Now in a well-established tank it doesn't drive it down very much
or very quickly because it has
enough minerals in it that stay in it to be able
to maintain a high enough mineral content in the
water to keep the pH stable.
This particular aquarium I keep
my hands out of. I may go in it if
a lot of algae grows on the glass
in order to be able to see into it.
I'll use a magnet or a scrubby
the plastic scrubbies are best
to clean it off.
And I will put plants in and pull
plants out. As I said, I use this tank
as a mother tank for many of my other
aquariums. It produces such a tremendous
amount of plants. I'm going to be focusing
on this process for a while
I want everyone to get comfortable with it
to learn how to do a dirted tank
that remains a healthy
balanced aquarium for as long as you have it
go slow, be gentle
above all do not overfeed
The best way to kill everything in your tank
is to feed your fish until they're not hungry anymore.
A hungry fish is a healthy fish.
A fish that is not hungry is sick and will likely die.
Do not feed
so much food to your fish that they become satisfied.
They will not be satisfied. They will be sick.
A fish takes only two hours to
digest its food, so it's always hungry.
In the wild or in an aquarium, you want your
fish to be hungry, to be looking around
for food all the time. So don't overfeed.
Keep your aquarium quiet, well-lit,
balanced, and safe, and you will be able
to maintain healthy, happy fish for years.
This is Father Fish. Please remember to
hit the subscribe button.
It helps to get more people involved in these
instructional videos.
Hope to see you again soon.
Bye for now. Here's a look at
this 40 gallon long.
You can see the tremendous plant growth in it. It's just
full of plants, front to back.
And I pull them out probably once a month. There
should be some fish along here.
I can't imagine they're all hiding. There are a few
at the top might be able
to see the buffalo head
in his cave he's in there I
can just barely see his face looking out there
are some shells here for the shell
dwellers they're either hiding way up
inside or are off looking for food there
we go look at that a little female just went
in so there's a pair of them in
there now it looks like they might have something going
once the pair start
going in it's a pretty good chance they're gonna
be some babies in there
hope you enjoyed this little video
of my 40 gallon long 20 year old aquarium
Bye for now.
