My sump is a rubbermaid tub and its filled with scrubbies so pics wont help.I usually dont deliberatly put fish in there but every time I clean it out theres fish in it.Fry or eggs that got sucked into the overflow.Yellow labs,applesnails blue reef afras to name a few.There were these orang cichlids I couldnt identify,didnt look like anything I had ever kept,must have been hybrids.