Fanatic put it the right way about eating uneaten fish food and even aglea, but they produce as much algae as they as they eat because their waste also breaks down eventually into nitrates. They also need oxygen so they will compete for it with other tank inhabitants. And if you couple turned into 25, eventually your 25 will turn into 250 and so on.Fanatic said:Well, for one they will eat uneaten waste, that's a pro.
Another, they produce masses of waste, that's a con.
Thanks..i hope the cucumber is safe for guppies and tetras..right?Coradee said:They won’t exactly stick to the cucumber, they’ll come out to feed on it overnight, in the morning you can remove it & dispose of them.
It won’t get rid of all of them but will help keep the numbers down if you do it regularly.