Currently I have a fishtank, and that led me with an idea like this:



Aquarium (25 construction needed)

6 hotspots: 2 Aquariums, 2 filters, Storage unit, and Centrepiece

Aquariums:

Fishbowl (25 construction) 1 fishbowl with fish, 3 planks, 3 nails (holds one fish)

Fishtank (30 construction) 4 molten glass, 3 oak planks, 2 buckets of water (holds 2 fish or 2 crayfish)

Large Tank (35 construction) 8 molten glass, 6 teak planks, 4 buckets of water (holds 4 fish, crayfish or turtles)

Gilded Tank (45 construction) 8 molten glass, 6 mahogany planks, gold leaf, 5 buckets of water (same as above, or 1 shark)
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Filters:

Crude Filter (26 construction) 3 planks, 3 nails, 3 molten glass, 1 small net, 1 clockwork, 1 soft leather. (works with only fishbowl)

Filter (31 construction) 3 oak planks, 6 molten glass, 1 small net, 1 clockwork, 1 soft leather (works with any up to fishtank)

Pump (36 construction) 3 teak planks, 9 molten glass, 1 small net, 1 clockwork, 1 soft leather (works with any up to large tank)

AMCE Water Cleanser (41 construction, as well as 41 mage) All parts must be purchased from Ali Morrisane in Al Kharid or Harry in Catherby (works with all filters except fishbowl) Parts are: Pipe section, Main Pump, Hoses, Bag of rocks, Bag of weird rocks, rain bar, pre-filter, Auto-function Scroll.
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Storage units:

Shelf (25 construction) 3 planks, 3 nails (provides infinite amount of fish food)

Bigger shelf (30 construction) 3 oak planks (provides infinite amount of fish food and sardines)

Pet larder (35 construction) 3 teak planks (provides infinite amount of fish food, sardines, and beetle bits

Exquisite larder (40 construction) 3 mahogany planks (provides infinite amount of fish food, sardines, beetle bits, and herring)
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Centrepieces:

Brown Rug (2 construction) 2 cloth

Rug (13 construction) 4 cloth

Opulent rug (65 construction) gold leaf, 4 cloth.

Indoor Koi Pond (70 construction, does not need filter if other filters are present) 5 soft clay, bucket of sand, 3 limestone bricks, 6 buckets of water, 1-5 bags of Koi (bought from a zookeeper in the Ardougne zoo)
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Turtles and sharks can be obtained from either the zookeepers in Ardougne, or Harry in Catherby. The prices are as follows:

Turtles: 300gp ea
Sharks: 30,000gp ea

Note: these cannot be cooked, and they are in boxes.
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Here's what the pets eat

Regular fish: Fish food
Crayfish: Sardines
Turtles: Beetle Bits
Koi: Beetle bits or Fish Food
Sharks: All fish

A nice idea to be honest...

cool idea

Level requirements for gilded are far too low. There should also be many more variations of Aquarium types and spread throughout a broader range of levels. Maybe even have reptile exibits in this room too, or perhaps even an avitory (or whatever they call them) for birds.

+1.

Good idea though.

Good idea, but it misses synergy. Just like other rooms work with skills, this should do the same. Prehaps a need to fish the fish yourself with... Fishing, or use hunter to hunt the fish, even the production of tertiary for summoning.