I transfered 2 tanks into 1 larger tank. I have noticed some of the coraline alge is turning white. I used about 25% of the old water and new sand i put a cup of old sand in there. I have tested my water my ammona level is lil high. i do have new lights vho from pc's but havent been running then as long to not shock anything. my temp has been running lil lower then it used too