otto wont get wrong 1 la, very easy to find, unlike SAE and flying fox, they look 95% similar and very hard to differentiate...
yeah, otto is the best choice, SAE can be territorial and offensive when they grow big, they can even grow up to 6 inch...... so otto is way to go. you can also try adding apple snails, they do help eat a bit...
donation is a sensitive word to use in our country for now. hehe....
somemore still want cantik 

donate cannot la, sell you cheap can la, then throw in some for you too. only if you are interested....

p/s: pure strain guppies... not longkang guppies....