Board Thread:New on My Singing Monsters Wiki/@comment-36947546-20180918094120/@comment-27661991-20180924080229

I don't have such a spreadsheet, but if you want to farm it really just boils down to this:

Number you can place on the island * Earning rate of each Ethereal * Maximum income

Because the Two-Element Ethereals require 10 beds, while the Single-Element Ethereals require 5, a Two-Element Ethereal would have to have twice the Earning Rate of the Single-Element Ethereals to be worth the bother. Suffice it to say, none of them do - not even in Rare form - so stick to Single-Element Ethereals.

In terms of Earning Rate, all Single-Element Ethereals of the same class have the same Earning Rate - e.g. at Level 19/20 it's 54 Shards/Hour for regulars and 68 Shards/Hour for their Rare counterparts. So when you can, breed the Rare Single-Element Ethereals.

That leaves the maximum income. If you have to stay away from the game for a while it's best to come back to more Shards vs less Shards (I know, logic, right?). Besides leveling up, there are some differences between the Single-Element Ethereals in terms of the maximum number of Shards they can accumulate before you have to collect. Figures given for level 20 in the wiki: Rare Ghazt: 417 Rare Grumpyre: 399 Rare Reebro: 434 Rare Jeeode: 434 Rare Humbug: 434

Which would make it much better to have a Rare Reebro/Jeeode/Humbug vs a Grumpyre.

So, tl;dr: Get as many high-level (leveling them up costs a lot of food - remember that getting 2 at level 8 produces more and costs less than getting 1 at level 10) Rare Reebro/Rare Jeeode/Rare Humbug Ethereals as possible.

Also don't forget that Wublins and Celestials will produce Shards. A Zynth farm / fully decked out Celestial Island will make for nice additional Shard and Diamond income (though Celestials are stupid expensive, Diamonds-wise).

Good luck!