Friend I think that you should raise the degree of difficulty of funcaptcha, and also cancel the enter this key.
change to
and put in the in the footer for example
Now tell me how many visitors does your website?
Thus you could calculate the amount of satoshi, for example 400 satoshi by 3000 would be 1200000 satoshi

Ii happen again
My faucet was dried in two times in two days, (.01 Btc each) and te earnings in adSense are too slow

I'm not skiled in programming but i'm thinking how to reduce damage from that bots without blocking

I'think we can analize IP's and wallet adresses from the FoucetBox DB, and see all that you guys commented before and when some of those adresses came we can modify the amount of satoshis they get to 1 each time, same to referrals...
please tell me if this is a good idea.
thanls in advance,