I have a bare-bottomed tank that was set up as a hospital tank but is temporarily housing a bunch of young mystery snails. The snails will be out of there soon and I plan on keeping two pairs of Endler's livebearers in the tank. Just today I noticed several (maybe five or so) mosquito larvae swimming around in the tank. There are a couple of small openings in the hood but there's decent circulation with the HOB filter. I tried netting some of the things and was going to toss them in another tank for my fish but they're pretty good at avoiding being caught (I have a ton of hornwort floating in the tank that they dart into).
So my question is, will fish still eat them at the pupal stage? They seem like they'd be much easier to catch, then. And, in the meantime, do they pose any threat to my snails?
They won't harm your snails, although when they grow up they might harm you!
The fish will eat just about any bug-product, so yes, they'll eat the pupae, but be forewarned, it only takes 2 days for them to emerge as adults, so you'll have to be really on top of things.
Just be aware that often dragonfly eggs are laid with mosquitoes, and the larvae will kill your fish. If you're paranoid you can freeze the larvae before feeding them which will eliminate the risk of introducing the dragonfly larvae through that food.
Well, the hood on this tank is one of those form-fitting plastic hoods that comes with starter kits that only has precise openings. There's a perfect cut-out for the heater and filter, and the only other opening is a small hole for airline tubing. I'm not using an air pump on the tank so I suppose this was the point of entry. The hole's only about 3mm across so I don't think any dragonflies could get in there. Plus, I haven't noticed any dragonflies flying around my house!
This is actually the hospital tank that's currently housing your snails, so as soon as I ship your snails out I'm heading to the LFS to pick up two pairs of the Endler's. They should take care of the larvae for me!
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