There are very few "definates" in this hobby...Generally speakingLions do not do well with the "bad boy triggers", the Clown definately falls in that catagory. There are exceptions to the rule, but in general Triggers nip at slow moving fish, it may work for quite a while, but CT's are known to "snap" and get very very nasty overnight....There is a guy on here that has that combo in a similar sized tank and they are doing well, I think "sk8shorty" is his name, again there is always an exception to the rule.