Cheap Filtration System for a SMALL Aquarium: 5 Steps

I have a small table top fish bowl. With 4 small fish no filter. The water
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Although some gardeners choose to add a small sponge filter, a plant bowl is a small, usually unfiltered, unheated and very densely planted version of an aquarium. A planted bowl doesn’t contain any fish and is more of a little indoor garden than a fish tank. They are simple and don’t require as much maintance as a real aquarium, which makes them great for both fishkeepers and people who are more interested in regular gardening. You don’t actually have to use a bowl; contains more information about a planted beverage dispenser, so think out of the box!
Aquarium Undergravel Filters - Simple Filters for Small Fish Tanks & Fish Bowls
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This is my small fish bowl with ~1.5ltr water capacity. Its been 2-3 months now after adding the first fish. I know that it is not a good practice to put fish in bowl, as fish needs larger area like aqua specialists/purists say 1gallon for 1 inch fish, but I can't agree with that opinion as even though we are putting fish in a large tank its in a tank not free, so tank/bowl, we are all on the same boat :)
but one need to study/analyze the fish behavior/breed so that fish would survive in the given environment.
In this small fish bowl set up I used platy, a pair of neon tetra and a pair of baby guppies. There are only few fishes that could survive in a small environment such as a fish bowl. Guppies, platies, neon tetra, are some of them which doesn't require much resources and they do fit together. I have tried to make a small aquascaping by putting 2 gravel rocks(home backyard), Java fern, hornwort(not sure), soil(not substrate, home backyard soil washed a couple of times), a pipe for hiding spot. Well lit room(sunlight) provides facility for plant growth.
So is this set up self sustainable?Nope, because there wouldn't be any chance for mating/offspring in this setup, and I need to remove a glass of water and top it up weekly, so that doesn't make the system sustainable. I don't like adding filter/aerator as this consumes electricity :D
I may add java moss so that the bottom would get a carpet sort of layer.

All comments/critics are welcome!! Please don't say about the fish feelings living in this bowl, I think they are happy :D and I'm not a vegan, I do eat fish with my meals. I know that I'm responsible for the life of these fishes and I do try my best to take care of that life( I know persons who dump the fish when they are bored) Get Small Filter For Fish Bowl. Get Instant Quality Results at iZito Now!
Photo provided by FlickrSure, you don't need a sophisticated aquarium water filtration system for a small fish bowl or a small betta tank
Photo provided by FlickrFilters are available for traditional tanks, decorative containers and goldfish bowls. The smaller your fish's habitat the greater the need for filtration.
Photo provided by Flickr
If your fish tank is either under ten gallons in totalcapacity or is not filtered, it is a small tank or bowl andshould only be considered by experienced aquarium keepers whounderstand the drawbacks and disadvantages of such an environment forpet fish, and are willing to take on the extra challenge and additionalmaintenance required for these small aquariums.Fish bowls are slightly different from small fish tanks. Primarily,since a fish bowl does not have filtration (see the definitionsabove), a fish bowl is only a septic tank collecting thefish's waste and making the fish soak in it.Because of their small size and frequent lack of filtration, smallfish tanks and fish bowls require a great deal more maintenance than alarger fish tank that has a reasonable probability of becoming - andremaining - stable.Remember that even if you take these precautions, and make aneffort to make the small aquarium or fish bowl a better place for yourfish, you still have not overcome that small water volume issue, whichis the primary problem with these fish tanks. Adding a filter oragitating the water will not significantly reduce the maintenancethese small aquariums require.Also, the more frequent the water changes are, the less importantit is that the water changes be small. By keeping the frequency ofthese water changes high - at least twice a week for a small fishtank with a filter and at least every other day for a fish bowlwithout a filter - the stress of the water changes issignificantly mitigated.Everything I've read about keeping aquariums always ALWAYS says that a small tank is a bad idea for a beginner (the reason for this is the fact that even a small amount of fish waste can drastically change the water quality when it's dissolved in just a little water, so you need to keep a careful eye on water quality, and understand the factors that affect it). But what if you just want a little fishbowl on your desk (or wherever), and don't feel like sinking over hundred dollars into setting up a respectable size tank (i.e. 10 gallons or more, and believe me, it will add up to that much or more, with tank, stand, hood, filter, air pump, gravel, decor, chemicals, etc). On the other hand, you don't want to just have a betta death-trap, where you change the water from time to time and hope your fish doesn't die. You can always shell out $30 - $80 on something like the Eclipse Explorer (prettier kinds are on the higher end of that range), and have a relatively complicated setup to clean and maintain to boot. Or you can set up a very simple and very effective filtration system in your existing tank for about $12. However, I must point out that a filter doesn't replace the need for frequent partial water changes.