I understand your dilemma....I had the same problem--I really wanted one before I should have gotten it, and I lost him. Nitrates should be lower than 20, the anemone will likely not tolerate it.
Sources of nitrates are tap water (should use ro
water only) and overfeeding (should only feed every other day if possible)
I would suggest working on getting your nitrates down with RO
water changes over the next month or two, then possibly getting one.
Also, what kind of lighting do you have and what size is your tank? Anemones require good lighting....I have PC
4.7 watts per gallon, and this is on the minimum side I believe.
The anemone/clown relationship is one of the coolest around--I thouroughly enjoy watching mine together. But keep in mind that there is no guarantee that your clown will host the anemone, it's just a chance you take.
Mine took about a month to host, but it's pretty cool.