angelfish food

This pair of mine after two successful batches, now they are busy cleaning the slate since a month but never layed eggs yet. All water parameters are accurate and Ph is always between 7 and 7.5 and TDS is always between 140ppm and 200. And tank is situated near other breeding tanks and is free...

I need a clarity on this, this question may sound stupid but still ... Can we feed "Australian Black Worms" to Angels ? (pic attached) a) If NO, why ?? b) If YES, then can they be fed on a daily basis ? c) If NO, why ?? d) If YES, will the bio-load have a effect on a planted tank in any...