Help!!! Aggressive young Platt!

[Bangster]

One of our young platys (5 months) is attacking the Dory’s. He won’t leave them alone to rest and is permanently pecking at their dorsal fins. I’m worried that they may be effected by this. Strangely enough all other offspring from this bunch have also disappeared in the last few days. Could he be the culprit??? He’s still only a quarter of the size of a fully grown adult.

[goatnad]

What size tank and how many of what fish do you have?