So, I when I was playing terraria, I stumbled upon goldfish farms. I was pretty much absorbed to it especially when it didn't function well. So I spent some time making this. Pretty much it. It generates 26 platinum per hour. The switch indicated by the red brick is the reset, the next switch starts the factory, the third one spawns a crab which will put the merchant in his place down there. Here's how it works. First of all, I made 2 versions of the farm. The one on the right is what I use. It is used only on regular days and nights [due to bloodmoon, corrupt goldfish dmg you big time(with high defense, cross necklace+bands of regen, this isn't a problem)]. You can let an NPC in to sell those goldfish, but you need obsidian skin potions [Alternative method:for the central spawner, get the lava out and just kill them with a fast sword or any weapon you prefer OR use spiky balls (useful if you don't have the luxury for obsidian skin potions)]. I made it really compact so that all goldfish will be accumulated. The one on the left uses a breathing reed and although you take lava dmg when entering, it isn't much(you should by now, have high tier gear). It is used on bloodmoons (bloodmoons give lots of money, more than the other setup) Overall, I recommend them both but it's up to you. So here's the wiring: As you can see, I connected each statue to 3 crab statues(just imagine the wires being connected xD). This is the maximum spawn rate of the goldfish. Actually it is possible with 7 fish statues, but again, NPC can't come in and it is very buggy. Some goldfish statues might not spawn to their max spawn rate. Next is the crab engine. You can use any crab engine design but this is more efficient since you only need two switches(the other being the reset). Wiring: With this setup, the crab traps itself in the box. No need for another button to trap the crab.This may not work but just add a hole like this:And make sure the stone block is active. Works all the time. Connect it with other crab engines like this:Wiring: One switch and all crab statues will spawn. I made it so that they'll spawn one by one. If you'll connect the switch to all crab statues, some fish statues won't spawn goldfish(explain later). That's why I set it up that when one crab spawns, another crab spawns, and so on. You can make it more compact though like in the first pic. It might be very complicated in making the wiring so I'll just post my wiring. If you are confused why your farm isn't working read the rest of the post. You might wonder why the last crab statue (the one on the top) is separately controlled by a switch. I don't know if it's a bug but it depends on the distance between statues. If you connect 6 crab statues to one switch and leave no spaces, only 3 spawn, but if you give enough space in between them, all 6 will spawn crabs [though with 7 statues, the 7th one should be far away(I think two blocks or more than the last crab statue in my farm) and I assume the distance needed between them will increase the more there are]. The horizontal setup I showed you has enough space between them so that all 6 will spawn at the same time. Now you might wonder why I didn't just connect them to one switch. It's because there's this fish statue. Same rules apply to the fish statue. Since the farm is compact, little space between the fish statues, only 3 statues will spawn goldfish. This is because there can only be 3 goldfish spawning at the same time(when there are little spaces). But if there is space, all goldfish will spawn. There shouldn't be space coz' a goldfish farm should be compact. Anyways, when 3 fish statues successfully spawn 1 goldfish each, they will continue to spawn them. So that's why I made the setup so that when one crab spawns, another spawns, and this will make a gap between each crab's time to hit the pressure plate. So, yeah that's all and my head is aching . Oh and don't forget about how crabs despawn when they are out of the screen. My design can be improved by making the last crab statue higher so that you don't need a switch to manually spawn it. Just make it higher and connect it to the previous crab statue's pressure plate. Also make the switches closer to pit. HAPPY NEW YEAR EVERYONEtest Note: Activate the crab statue that will put the NPC in it's place and then kill it. That's when you'll start the factory. Cheers!