Heros efasciatus fry question

  • We are currently upgrading MFK. thanks! -neo
The seperatet fry (around 250) are in the moment in 160 l and I plan to move them when they are a little bigger 1.5cm or 2cm in a 290 l . They get every day minimum 80% waterchange spread over the hole day by very slow fresh water goes in and same amount goes out by overflow and I see them graze on the sponge filter and plants I have in there.
The 6 feet tank with around 756l with the parents with around 50 frys ,2 kind Silverdollar and a few small Ancistrus get every two days in the same way waterchange. The fry also graze on everything,wood spongefilter stones.
How long the pair will protect the fry. Can the silverdollar be a danger for them when they are not anymore protected?
When something is wrong what I do please let me know.
 
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