I think it's just normal leech lol, i only know this when someone shared it on r/aquarium or something, can't remember. They occasionally take it out to feed them their own blood.
Ooh, I'm so relating to this, due to me having highest CO2 and heat among, every time there's invasion.
So, you settled it how? DE spay for how & how long? Just interested to know if it come in handy for me.
(My method normally just "head hunting" for their hideout, while suffering bites few weeks. Yes, I know the hair dryer and powder method, I just don't want a big fuss trying them; so enduring bites.)
Edit:
Each time I found their hideout, I learnt about their hiding "habits". Some of them convinced me of intelligence besides human, disturbingly terrifies me.