I do, i also lick my fish and play witht heir poo. No my point was that that there can be toxins so don't let them into your body.
Really? I thought only i did that....
Ostracods
What are they? Kidney bean shaped crustacean up to 4mm long, resemble small mobile spots scuttling over your substrate. Usually yellowish or brown black.
Why are they here? Normally introduced with live foods and/or plants. Multiply well in a poorly maintained tank.
Harmful? No, but if the cause is not rectified they will easily multiply and can eventually get to an almost plague like number.
How can I get rid of them? Good tank husbandry, will also be eaten by small fish.
Asselus
What are they? Vaguely resemble water borne wood lice. Colonise filters and nooks and crannies in the tank.
Why are they here? Introduced with (or sometimes as) live foods.
Harmful? Not directly although commonly associated with the introduction of other parasites.
How can I get rid of them? Good tank husbandry, ensure when tank is cleaned all decor is well cleaned paying particular attention to any difficult to reach spots, will also be eaten by small fish.
Tubifex
What are they? Small red-brown worms tend to protrude from the substrate.
Why are they here? Introduced as live food, but as a result of overfeeding (or lazy fish) burrow into substrate and begin to breed and multiply.
Harmful? Nope.
How can i get rid of them? Stop feeding your fish (for a while), they will eventually use the tubifex as a food source.