Went there on Sunday.
Price for Thais written in Thai 30/20 Baht for adult/kid.
Price for Foreigners written in English "Price for Foreigners" 30/20 for adult/kid.
Its a 30-60 minute experience depending on how young your kids are and how interested you are in fish. Have about 50 small aquariums, one bigger one and a huge one with 2, 12 meter walkways where you can walk underneath.
Its worth the money a lot better value than the 1500-2000 I paid for the foreigner price at Siam Paragon and we spend about double the time at Siam Paragon.
The total cost were 119 million Baht, the outside area seemed a little unfinished hopefully improvements are coming to the playground and park so it will be more worthwhile to go there.
Took a few pics I will post in the a few days.
Combine it with a trip to see the monkeys at the "Zoo" in the park and with lunch you have a day trip if you come 1-2 hours away.