Not firmiliar with frogsspawns. But I can tell you anenomes can be disasterious to a tank with corals. And sometimes they can be fine.
Remember they can move all over you're tank,get stuck in filters and powerheads....all kinds of stuff.
And sometimes they will make their home and stay put. Luckly for me this is what happend. He did get stuck in the power head a cupple times though.![]()