30 second Ultralith challenge

[marie]

Here is my 50g tank, 3 maxi jet 900s, vho lighting, bak-pak skimmer and heater, kalk and occasional water changes.
This was my easiest tank to care for, nothing seemed to phase it, if i forgot to do water changes for a couple of months? It didn't care. If I forgot to add kalk for a week? It was all good . Of course at this point it had been set up for 5 years