Quetzalcoatl

They look like white cloud minnows.

Something is rotten in your tank, a piece of wood? dead plants? This is my guess because of the smell bacteria produce when they are in action.

The best you could do now, is an actual water change with properly conditioned water, and also you need and air stone. Fish at the top is a sign of low oxygen in the water.

I have two of these. While they were babies I housed them with endlers and snails, little by little the endlers and snails disappeared. They are very good hunters and will eat anything that fits in their mouths. I like their primitive looks

That makes sense, lol. Actually the name of that song sounds more like italian... I am glad to know you are not miserable, lol, happy owners keep happy pets

I was curious, because of your username :cry:

Miseria means Misery in spanish. Not a very happy user name

Do you speak spanish?

It looks like a jelly fish and an octopus got together and down to business. The result is this creature.

Nature works by doing frequent water changes. Lakes that get not new water turn toxic for fish and plants, and extremely salty. There are a few of these lakes around the world that eventually will dry out. So, a hobbyist doing frequent water changes is just imitating nature, not avoiding to deal with the mysteries of stagnant water.

Some lakes accumulate and trap toxic chemicals at their base. Scientist also have found that under the sea carbon dioxide is stored. When these chemicals are finally released they can seriously harm all living creatures. There was a case in africa where people just fell death with no explanation. After some research scientist conclude that the cause of their death was a lake that released a toxic cloud.

Nature is Chaotic and changes all the time. The idea of creating an environment with living creatures that never changes and that is extremely stable is not realistic.

There is no way for people to control the "everything else". People cannot even control their own bodies, heath, or mind....

In my fish tanks, plants grow, fish are happy but I am very very far from controlling the "everything" that takes place in there.

I have the horrible impression that almost in all animals, it is the male the one who wonders about the females and tries hard to impress them. Females just have to pick the best out of their multiple options. This is why often males are more fancy and colourful like in bettas and endlers while females are dull looking.

I think your female fish most be thinking something completely different :cry:

Sadly we have stolen from our pets the right to pick their mate. We give them not many options. It is more like arranged marriages for the convenience of the pet owner not the fish themselves.

I keep discus, and I think your tank is too small. Discus look cute but they are aggressive and grow large 6 to 8 inches. I keep mine in a 230 gallon tank, and there is a dominant guy who picks fights with the others and chases them around. They also love hiding, so you need tall hiding spaces and plants in the tank. In addition discus are extremely picky with respect to water conditions. A larger tank with excellent filtration ensures the chemistry of the water is more stable and big spikes in the tank parameters, that can kill your discus, are less likely to occur.

Finally discus are more likely to survive in a home aquarium if you buy them close to full adult size, adult specimens are expensive, and you don't want an expensive fish to die a few days after you got it :cry:

To be honest I think a 30 gallon is better suited for very small cute fish like danios, tetras, shrimp, guppies etc...

I have met some doctors (PhDs) that lack any useful intelligence, and that are nothing but arrogant ignorant idiots. Many PhDs are just unintelligent people able to solve basic problems, memorize text books and get through the crappy educational system of the first world by using their students to do the actual research and write their papers.

Many of the most successful innovators and business men in our world didn't even finish a bachelors degree. You cannot judge the intelligence and creativity of a man based on ridiculous titles invented by our society.

Yes, in the pictures she doesn't look like a girl. Nice colours, I guess selective breeding is making the girls better looking.

In my tank I keep floating water lettuce and very large gigantea vallisnerias, Therefore the light under the plants is dim and the fish like it like that. The Vals create a large perfect hiding spot under water. Also I live alone so there is not too much traffic at my home. Some people just move their tanks to a part of the home that is not busy, like the basement.

I had the same problem with my male endlers. When I first got them I saw a male chasing a female, and a weird flat worm like thing under his belly moving up and down. I thought it was some sort of parasite like anchor worms. I almost pull it out with tweezers :cry:

Luckily, for my fish, after some research I found out what this thing was.

Maybe she/he just need some time alone. Some fish get very stressed if they are in a high traffic part of your home, constant noise and movement around them drives them crazy if they cannot hide. Finally the natural instinct of fish is to hide from potential predators. If your fish is swimming fast around the tank and trying to jump, it is obviously under a lot of stress and cannot find a place it considers safe to hide.

If you keep doing this, and selectively breeding her offspring you will develop mini-arowanas

I keep vallisneria gigantea with my large fish and they do well together. If you want to keep yours substrate clean and if it is sand, you can get some large geophagus. I just keep rocks near the roots of the plants so the fish cannot dig them out. Also I have water lettuce floating on the top.

You can find young motoro rays in calgary for 150 bucks, but they are very picky regarding water conditions. I think most predatory fish are loners. Arowanas are not shoal fish. They don't get depressed if they are by themselves. Perhaps before getting tank mates you should wait to upgrade your tank.

Make sure your tank is not very bright and also give her a place to hide. Floating plants are ideal for arowana tanks.

How big is your tank? There are some large friendly fish like pacus. Pacus and silver arowanas live side by side in the wild. Also I have seen arowana display tanks with large silver dollars and clown loaches.

This is a bacterial infection caused by stress, under this condition the fish bloats but it cannot feed. It is just internally swollen and suffering until it dies. You should check in a fish store for possible treatments and medications. Also check your water and look for possible sources of stress.

Try feeding her living super worms, crickets, or frozen shrimp. Also check all parameters in the new tank, because if something is wrong in the new tank she might be stressed and starve herself to death.

If they are not feeding on your fish, they are not parasites. Planaria worms are very common, their population explodes if there is plenty of food waste available. Don't overfeed your fish and their population will decline to the point you won't notice them anymore, but they will be still around

Suicide rates on fish are too high. I wonder why they do it. Aren't they happy in their tanks?