when I rent an apartment, I wont have much space in my room so tall tanks will be to my advantage. I hear it is very easy to make tanks taller because the plastic rim and lid will fit. example:

10, 15 high, 20 extra high all use the same standard 10 gallon lid and black frame for top and bottom of tank.
20 high, 30 extra high
20 long, 29, 37 high
30 long, 35, 40 high, 45 extra high

more examples for larger tanks such as 90, 100, 120, 150, etc in long and high versons. 29 gallons is a very common size, I can get lid and stand for that cheap. Id like a 45 extra high using the same dimensions of my 29g except make it 27 inches high!

many MANY tanks have the same footprint, so you can use the same lights and hoods and stands, like the 55, 75 have the same footprint

isnt the 75 just wider than the 55 or is it just higher? I was not aware of a tank with the same footprint but taller than the 55!

75g=48x18x21
55g=48x12x21


yes the cover will fit a 75 but there will be 6 inches gap on the back and the light will be offcenter. I am thinking of a 150g and using 2 standard 55g covers. That means the light will be on the front and back with none in the middle but itll diffuse to the middle of the bottom anyway. the first cover I wont make any holes. the 2nd I will for 4 filters. alternatively I can make my own cover from cut glass and a wooden hood with 2 lights and I can fit 6 filters(2 small ones on the side)





identical to the 29g but 22" high instead of 18" means more room, I can place 3 fish in there then. I will see if any petstore can make a custom tank like that but 27" high for 45 gallons

Guess again. How in the world will you take off that old silicon sealant? It doesn't come off that easily. And the second and IMPORTANT thing to remember, the TALLER THE TANK, THE THICKER THE GLASS NEEDS TO BE. A low tank doesn't need that thick glass because the pressure of the water is outwards. But once you raise the height of the tank, gravity comes into play. The water's weight puts a BIG pressure downwards and outwards. Just imagine, a 15g tank's glass is thinner than a 20g tank. But a 20 gallon tank is only 4 inches higher. Why do you think manufacturers did this?

of course I know the glass will be thicker, I am willing to pay for this. I just saw a chart of a 50 x-tra high, I think ill take that. Probably gonna cost $100 easy but its worth it. A standard 55g is $100 for tank and lid.


2 1/2 mini 12 3/16 x 6 1/8 x 8 1/8 2.6 27
5 1/2 Gallon 16 3/16 x 8 3/8 x10 1/2 7 62
10 Leader 20 1/4 x10 1/2 x12 9/16 11 111
10 Long 24 1/4 x 8 1/2 x12 5/8 16 116
10 Gallon 24 1/4 x12 1/2 x12 3/4 21 170

15 High 20 1/4 x10 1/2 x18 3/4 22 170
15 Show 24 1/4 x 8 1/2 x16 5/8 22 170
20 High 24 1/4 x12 1/2 x16 3/4 25 225
20 Long 30 1/4 x12 1/2 x12 3/4 25 225
25 Gallon 24 1/4 x12 1/2 x20 3/4 32 282

29 Gallon 30 1/4 x12 1/2 x18 3/4 40 330
30 Gallon 36 1/4 x12 5/8 x16 3/4 43 343
30 Breeder 36 3/16 x18 1/4 x12 15/16 48 348
33 Long 48 1/4 x13 1/2 x12 7/8 52 382 X
37 Gallon 30 1/4 x12 1/2 x22 3/4 45 415 X

38 Gallon 36 1/4 x12 5/8 x19 3/4 47 427 X
40 Breeder 36 3/16 x18 1/4 x16 15/16 58 458
40 Long 48 1/4 x12 3/4 x16 7/8 55 455 X
45 Gallon 36 1/4 x12 5/8 x23 3/4 66 515 X
45 Long 48 1/4 x12 3/4 x19 60 510 X

50 Gallon 36 7/8 x19 x19 5/8 100 600
55 Gallon 48 1/4 x12 3/4 x21 78 625 X

60 Gallon 48 3/4 x12 7/8 x23 7/8 111 710 X
65 Gallon 36 7/8 x19 x24 5/8 126 775
70 Gallon 48 7/8 x19 x21 5/8 165 865
90 Gallon 48 7/8 x19 x24 5/8 182 1080
100 Gallon 72 7/8 x19 x19 5/8 189 1180

120 Gallon 48 7/8 x25 x25 5/8 230 1430
125 Gallon 72 7/8 x19 x23 5/8 236 1480
150 Gallon 72 7/8 x19 x28 3/4 358 1850
180 Gallon 72 7/8 x25 x25 3/4 430 2230

20 X-High 20 1/4 x10 1/2 x23 3/4 32 232
30 X-High 24 1/4 x12 1/2 x24 3/4 41 340
50 X-High 30 1/4 x12 3/4 x30 1/2 98 590
80 X-High 48 7/8 x14 x30 3/4 200 990
110 X-High 48 7/8 x19 x30 3/4 228 1320

Remember, goldfish swim left to right. Not up and down.

Also...cleaning the tank would be a lot harder.

The fish might also have a hard time swimming because of the big water pressure at the bottom. I've tried to place a goldfish in a deep drum of water and it hardly swam at all... It looks like its having a hard time swimming.

thats funny that 2 feet or even 4 feet of water would give it a hard time. arent ponds like 4 feet deep or more? I know goldfish exist in the wild in lakes that are 30+ feet deep. yes goldfish swim left to right, I was thinking I would use the highest tanks for tropicals while I use the longer ones for goldies. which tropical fish besides angel fish like deep tanks

Yes, ponds are 4 ft and deeper, and it doesn't bother the fish. Reason being, the pond has a greater surface area, which means, its wider and longer too, not just deeper, so the proper conditions are established.
I have not seen a pond yet, being 4 ft deep, but only 2 feet long or wide. The ponds can be that deep, because the other two dimensions are greater as well!

it does not matter the width, the pressure is equal at a given depth. diving 20 feet in a pool, you will experience the same pressure as diving 20 feet in the middle of the pacific ocean The only thing I lose from a high tank is surface area for air exchange. However I will be sparsely stocked, the opposite of overstocked like I am now. I do not have the room for long tanks in my apartment. 50 gallons on a high tank is still alot and wastes will be diluted nicely, meaning less frequent water changes

tank plan for rented apartment


30 Gal. Cube Tank 20x18x21 whisper 3(if 2,2 wont fit)
44 Gallon Pentagon 22x22x24 whisper 2,2
30 gal extra high 24x12x24 whisper 2,2
50 gal extra high 30x12x30 whisper 2,2
65 gal breeder 36x18x24 whisper 3,3
150 gal high 48x24x30 whisper 3,3,2,2,2,2



apartment plan

4 koi in 150(37.5x4)(buy an ogon)
5 single tail goldfish in 65(13x5)
3 single tail goldfish in 44(14.66x3)
many tropicals in 30 high(angel fish?)
unsure for now in 50 high(4 fantails?)
many tropicals in 30 cube(gourimis?)

home plan

3 single tail goldfish in 45(15x3)
3 fantails in 35(11.66x3)
2 single tail goldfish in 29(14.5x2)


edit: I just realized so far per my plan I will have 370 gallons total of aquariums! at a twice a month 25% water change, thats over 90 gallons to change! what % should be changed in an understocked tank? is 25% twice a month enough or should it be 30%? I cant really change more than twice a month since ill be busy with my job, also ill be changing 3 tanks at a time so ill be busy changing water every weekend


edit again LOL:

150 high will be expensive at 300 easy if not $350. I checked the prices of a 225 which is identical to the 150 except 6 feet long instead of 4 and the same place wants $700 for it! I guess 150 gallons is gonna have to do for now, maybe when I get a better job and bigger apartment or even buy a small house with morgage(monthy payments till the house is paid off) I will consider a mammoth tank, perhaps 300 to 500 gallons since the house is much bigger plus ill be living in there for like 10 years or more. I know koi need a pond but if the tank is big enough, it should be reasonable for just 4 koi thatll grow to about 3 feet




the 44 gallon pentagon for the corner of my apartment

Actually, there is water pressure. As a scuba diver,
I expirience this firsthand. Be it in a pool, or a lake
or the ocean. The squeezing feeling on your ears
is the water pressure. You've heard of submarines
having a 'crush depth'? This is when the pressure
produced by the submarine is overcome by the
pressure of the water. If there was no water
pressure, we'd of explored the bottom of the ocean
decades ago.

Now imagine how a small fish would feel with the
weight of a vertical tank of water.

fish can withstand pressure of at least 20 feet depth, dont forget, they live in lakes in nature