midge larvae in cycling tank

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04 Oct 2020 14:25 #1 by rayserb (Ray Ball)
Dear Forum,
I am cycling a new tank. I have what looks like midge larvae (see attached). Do i need to get rid of these or will they be a welcome snack for new inhabitants
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04 Oct 2020 21:25 #2 by Debrush (Shane Lavelle)
I think it'll depend on how long it'll be before you introduce some fish and what temperature it's running at.
I regularly feed those same larvae to my tropical fish, but they're coming from outside (which is cooler and shaded), I think they typically take several weeks to reach maturity. They might mature quicker in a warmer environment and hatch, not sure you'd appreciate a swarm of these fellas living with you!
The sooner you can add a few fish the better.
Be curious what other people think?

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05 Oct 2020 11:04 #3 by rayserb (Ray Ball)
Nitrites still high so waiting for that to disappear before adding fish. Not bothered about midges emerging. Not that many if them (i hope). I brought a rock from garden which i had used for cichlid tank a long time back. Thought i had cleaned it well but the eggs must have survived. Tank at about 26C so they hatched. They are eating bits of fish food i have added to provide ammonia for bacteria. I was concerned the midge larva might harm the new fish or harbour other parasites?

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05 Oct 2020 21:12 #4 by Debrush (Shane Lavelle)
I don't think the larvae will pose any threat to your fish (They will be eaten up very quickly)
The only exception (I think) would be to eggs or newly hatched and immobile fry.
There shouldn't be any issue with parasites if the larvae or water they were in originally hasn't come from an existing aquarium containing fish. That said I'm open to correction on that.

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06 Oct 2020 17:54 #5 by rayserb (Ray Ball)
I'll keep gingers crossed. They are beginning to morph into flies. I removed a good few with sand syphon cleaner. Just videoed one releasing from under a rock and swim to surface. They just go completely stationary when they reach the top...avoid being eaten i guess.

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