Really depends on the type of anemone that you plan on getting. But, I wouldn't go any smaller then a 30 (( personally I think that 29's are to narrow front to back )). And with a 30 I would only consider a BTA ((Entacmaea quadricolor)) and maybe an LTA ((Macrodactyla doreensis)), all others, IMO, will outgrow a 30.
As for lighting, need to know the type of anemone before making a suggestion, the lighting (( and care in general )) requirements vary by anemone.
Toddrtrex: Would a 46 gallon bow with dual 175 watt, 14K and dual T-5 actinic work for a haddoni and two percs? On a tank this small, would I be able to include SpS and other fish? I saw a post where the haddoni ate a Yellow Tang.
Thanks
Do a 10-15% water change weekly with RO/DI water and do your top offs and you can keep a 1 gallon tank just as easy as a 100 gallon in my opinion and from what so many pros have showed me.