Teelie
Fish Aficionado
Just to be clear before reading on, I've never had this problem and we keep a clean house but it's winter time, so outside creepy crawlies are coming indoors for the heat.
Nasty roaches are starting to lay egg pods around the filter and they're hiding on it.
I've found four roaches, killed two, two escaped but jokes on them. I sprayed (very carefully) around the base of the stand so they'll die whenever they attempt to return again. Unfortunately there was not much else I could do. There's boric acid which I'm going to buy today and is a "green" alternative which me, my fish, and my girlfriend's mother (who is a health nut) will all be happier using around the tank and the foyer where they come in through the crack in the door.
Thankfully none of my other tanks are affected though one time I did find a harmless house cricket underneath a filter in my room that had laid eggs. I'd much prefer crickets. At least those I'd feed to my fish.
Nasty roaches are starting to lay egg pods around the filter and they're hiding on it.

Thankfully none of my other tanks are affected though one time I did find a harmless house cricket underneath a filter in my room that had laid eggs. I'd much prefer crickets. At least those I'd feed to my fish.