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@daniel.colquitt.xyz2. How much did it change what the filter knew afterwards?
The distinction turns out to be quite useful.
@neohibolites.bsky.socialHave some cichlid portraits. 🐟 #photography #fishkeeping
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@tanktherapyart.bsky.social“BOTTOM FEEDER… TOP TIER! 😂🐟 The Funniest Shirt for Fish Keepers!” www.redbubble.com/i/t-shirt/Fu...
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@daniel.colquitt.xyzTap-water nitrate T is modelled separately as a slowly varying Gaussian random walk. That is an assumption, but a more plausible one than treating the supply as perfectly constant.
[4/10]
@daniel.colquitt.xyzThis is the same mathematics as the “nearly constant velocity” model used in target tracking: N takes the role of position and r of velocity.
[3/10]
@daniel.colquitt.xyzMy hidden state is
x = (N, r, T)
with r the net accumulation rate and T the nitrate concentration of the tap water.
[2/10]
@daniel.colquitt.xyzIt has also been a useful excuse to revise some Bayesian filtering. I am not a probabilist in my day job.
[1/10]
@nilssandrisser.bsky.socialTwo of them recently started a brood, and the others also act as a pair.
Any cichlid experts around here who could give a possible explanation for that? Thanks a lot in advance!
@nilssandrisser.bsky.socialThis ist my group of 4 firemouth cichlids (Thorichthys meeki), busy with their ritualised negotiations of rank orders. In their phaenotype, they''re all male (pointed dorsal fin, genital papillae). But there's something weird about them.
@aquaristedge.bsky.socialYour TDS pen measures how much is dissolved in your tank, not what it is. I made a 2-minute doodle on what that number means, why it creeps up between water changes, and why shrimp care. #aquarium #fishkeeping youtu.be/Z8--_iAjmMc
@nilssandrisser.bsky.socialSo, when you buy neon tetras catched from the wild for your aquariums, you can do that (mostly) without remorse. But that can be different with other fish species.
@nilssandrisser.bsky.socialMy 3 green neon tettas are remnants from a larger swarm. By now, they are 8 years old, but still vital. Sometimes they look like blue sparks that flare up in front of a dark background.
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@neohibolites.bsky.socialStill one of my all-time favorite pics that I managed to shoot of my fish. 🐟 #photography #fishkeeping
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@bettaworld4bettas.bsky.socialJoin us in speaking up for betta fish 10/18-10/24 #endbettacups #fishwelfare #fishkeeping
@aquariumkids.orgA common goldfish (Carassius auratus). 🐠
Photo by Bjwebb (Public domain license; no changes made).
@chrisello.bsky.socialCurrently working on my next aquarium which will be the last setup for a while but my first opti-white tank. A gift to myself and here is a bit of the process as a sneak-peak before it‘s finished.
#aquarium #fishkeeping
