Yep, square sacs are assassin snail eggs
Will take quite some time before you'll see any babies as they stay undersubstrate until big enough to pop out. Cute tiny things
You should see yellow yolk soon if fertile and will develop.
Pics from my tank -
Assassin snail egg Adult assassin
[sharedmedia=core:attachments:75746] [sharedmedia=core:attachments:75747]
Will take quite some time before you'll see any babies as they stay undersubstrate until big enough to pop out. Cute tiny things
You should see yellow yolk soon if fertile and will develop.
Pics from my tank -
Assassin snail egg Adult assassin
[sharedmedia=core:attachments:75746] [sharedmedia=core:attachments:75747]