Cat said:Actually, having looked at your pic, why dont you use the MC 600 HOT skimmer, as you have no lid on your tank anyway, you can fit one of those wherever you like on the outside and you wouldnt have to adapt your tank in anyway.
Cat the picture you are refering to is not my tank. Mine has the standard lid, the problem is the fact this is a retro fit and the external filter intake and out flow occupy the small gap in the back of the tank on the left, this prevents the skimmer from hanging in the only position it can if you have kept the internal filter. I would really like to see some pictures of your modified tank, I still think you need to cut a hole the length of the skimmer because the holding bracket is higher that the rim of tank on which it hangs, which in turn means the whole skimmer is higher than the rim not just the collection cup.