Not sure if you remember the 400g tank I photographed? Well he doses kalk only. However, the more I research kalk, the more I fear overdosing. Did you have it set up with an ATO or stand alone?
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Yeah it's a fear. I was stand alone dripping it with my Apex controlling on/off at certain pH levels. Seemed to work pretty good. Seems most people I read using it not in a dedicated reactor are using it in ATO.
Update. Still chock full of algae, really just been on cruise control for a while. Kind of been neglected to an extent....still surprised at how well this tank is doing for my shoddy maintenance/care. Here are some quick bad photos of a filthy tank!
This tank is roughly right at 3 years old now, though I did have one crash a year in but ran the tank through it, so 3 total but 2 as it stands now.
https://c7.staticflickr.com/1/692/31...23c9b736_h.jpgfts Dec 2016 by Matt, on Flickr
https://c7.staticflickr.com/1/344/31...68aa5b68_h.jpgfts Dec 2016 by Matt, on Flickr
https://c5.staticflickr.com/1/754/31...54932588_h.jpgNeedles in a Haystack by Matt, on Flickr
https://c7.staticflickr.com/1/260/31...4300f1f9_h.jpgWarfare by Matt, on Flickr
https://c5.staticflickr.com/1/430/31...185ade5a_h.jpgCali Tort by Matt, on Flickr
https://c5.staticflickr.com/6/5611/3...f37f1750_h.jpgGreen Slimer by Matt, on Flickr
Be sure to check out the two little new growth sprouts on the left side, pretty cool.
https://c5.staticflickr.com/1/569/31...acf2c7be_h.jpgCoral Tops by Matt, on Flickr
Very nice Matt. Looking really nice.