Plants struggling all the sudden
I’ve had this tank set up for years with various changes, but it’s been exactly the same for at least a year now. My plants were doing really well, especially my hygro, but now it’s struggling.
It’s 50g, with pool filter sand and root tabs. I’ve recently started dosing liquid fertilizer again to correct the problem, but so far doesn’t seem to be helping too much. Plants are hygro, variety of crypts, sag, a couple of small sword varieties, giant duckweed and a few Anubias, nothing high maintenance, being the tank is supposed to be low-tech and low maintenance.
Recently, the old growth on my hygro has gotten covered in algae, and the new growth is incredibly stunted and twisted, which would suggest a calcium deficiency. But my water is naturally very high in calcium, I have a pH of 8.0-8.2, a gH of about 20 degrees and a kH of about 15-17 degrees, so that doesn’t make sense to me, not to mention the root tabs that should be providing nutrients.
Light is a planted+ 24/7, on for 3hrs, off for 4hrs and on for 3hrs, at about 65-50% brightness. Tank is very lightly stocked, 50% water changes every 1-2 weeks.
Any ideas what’s going on and why the sudden changes in my plants? They only started struggling maybe a month ago.