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We sell lots of them and they are very loved :) If using for shrimp or fry, you add mesh on the inside of the filter. That way its not even visable! The other easy mod is blocking up those slots entirely and then cutting into the top of the plastic wall above them to create some surface skimming action! This can then be meshed to! Most impressive the plant growth you can achieve with that little LED, and its kinda OP to even add another one.

Hi @Linda, My first thought is the vacuuming of the gravel, there is a lot of beneficial bacteria that lives in the gravel and the combination of a 50% water change along with the vacuuming may have kicked off a “re-cycling” of sorts... This could have caused spiking and consequently shrimp death... Just a theory, based on the mathematics, 15 gallons, 50% water change and gravel vacuuming... HTH ;) Sent from my iPhone using Shrimp Keepers Forum

The GH is too high. Which means the shrimp are having issues with the hard water. Issues like moulting. Tells us about your water change routine and what type of water you are using? Tap, RO, rain? Quickest and safest way to reduce GH is with RO water, then followed closely by rain water. But don't change out the water 100% in one go, it needs to be changed slowly over a couple of days, so that the shrimp acclimatise. GH might not be the only issue. Do you have any pics of the tank and dead shrimp? How long has this tank been running for? What additives do you add to the tank? list all of them.