I thought it would be useful to have the colours listed somewhere easily accessible, for future reference :)

Each requires a different combination of Piscis Aquebullae - one colour ready to harvest, and two different colours fully grown.  Any other colour apart from the ones listed will deter the wildlife, so you must have the exact three colours only.  If you want to have more of any of the colours, that's OK as long as you only have the listed colours.

KING PENGUIN requires:  RTH Orange, FG Red and Green.
WALRUS requires: RTH Green, FG Blue and Indigo
PLATYPUS requires: RTH Blue, FG Yellow and Violet
PUFFIN requires:  RTH Yellow, FG Red and Orange
SEA LION requires:  RTH Violet, FG Yellow and Indigo
OTTER requires:  RTH Indigo, FG Orange and Blue
SEAL requires:  RTH Red, FG Green and Violet

Copied from another thread because it's useful!

Ruth  and Begonia wrote
9 minutes, 29 seconds ago

Getting through with the least amount of gold - start anywhere, it's a loop.

Seal to Penguin      2
Penguin to Puffin   6
Puffin to Walrus     9
Walrus to Platypus 8
Platypus to Otter   5
Otter to Sea Lion   3
Sea Lion to Seal     3

TOTAL                    36

less the gold to change before the first critter, plus the gold to set up for the first.

The order is easy to remember, just follow the rfh through the spectrum

Thank you for both posts, Tracey! As usual, super useful info that we will all refer to many times, I'm sure. :-) You're the best!

Thanks for putting that in Tracy, the other thread was obviously deleted as a duplicate.

Thank You All Sweet Kind Fairies For Taking
The Trouble To Share :)))

In another thread has Karen and Jessica-Elise the following posted:

Sea lion: RTH violet, FG yellow and indigo
3 sprinkles
Seal:  RTH Red, FG green and violet
2 sprinkles
Penguin:  RTH orange, FG green and red
6 sprinkles
Puffin:  RTH Yellow, FG red and orange
6 sprinkles
Otter:  RFH - Indigo, FG blue and orange
5 sprinkles
Walrus:  RTH green, FG blue and indigo
7 sprinkles
Platypus:  RTH blue, FG violet and yellow
29 total sprinkles

I think Ruth's version includes leaving the fully grown plants to become RTH before changing to the next setup :)

It makes more sense to me to switch by waiting for the flowering plants to become rfh, then you have 2 possibilities of what to plant for next.  So after seal you would try for sea lion or walrus, grow another two Pisces, see what takes the least amount of gold dust to attract next depending on what you grow.  After walrus you would attract platypus or otter, and after sea lion you would attract puffin or otter.

That kind of idea, it relies more on luck, and it means you don't have a set plan, but there is no reason why it might not save gold dust in the end, if that is the goal.  You would only be planting two Pisces each time, and there would be no waiting between animals.

My understanding of these gold dust saving plans is it also involves replanting and waiting each time, I'd rather make use of the rfh plants and if I spend gold dust for a set up, I'm going to attract them for as long as possible.

Gold saving -

My version was based on how many it takes to go from one to another using the same plants.
It's also a loop - so one of the changes won't be necessary anyway. If you start with the Walrus, it only takes 27 to complete the set, plus whatever it takes to set up for the Walrus.

Where you start in the loop depends what colours you've got when the piscis flowers. I've used the loop,  having been held up by other things before I could get started, and got 4 different fishy critters one one plate.

I may misunderstand a bit, but I would approach it differently if the gold dust was not free.  I've attracted multiple different critters on the same platter because it's easy to switch with free gold dust.

If it were not free, and provided the goal isn't to colour in the seven animals as quickly as possible, I'd keep each set up until the flowers went ready for harvest and go from there.

Definitely more than one way to approach it.