about equips cleanning,I would use edible "citric acid檸檬酸". By soaking every thing in this solution for hours then gentlely brushclean,your equipments will be like brand new. then rinse them and put them in clean tap water for days trying to remove the leftover matters,(you may have them plug running in the clean water now and change 100%clean water everyday). the above is what I can think of and the way i would do!
and the artificial rocks thing, there are many sellers in PH8.4 , you search 人工活石 here and you will get many. like this ( I am not promoting this seller, just see their pics there are great demostrations)
http://www.ph84.idv.tw/vbb/showthread.php?t=180219&highlight=人工+工活+活石