That's a beautiful tank! Great work on it. The Marco rock is also very porous so I'm sure that is a huge benefit which worked in your favor. The dry carbisea life rock i went with isn't quality at all. There's no porosity to it at all. It's like solid heavy blocks of shaped concrete so this may have contributed to the issues I've had.I used all marco rock on my build and havn't had any problems. I am 16 months in now and only went through a small ugly phase back in the spring. I seeeded the tank with MB7 and GARF grunge and let it cycle for 3 months in a total black out. Tank is doing great! I would do dry rock again. I think the key was the GARF grunge.