I am wanting to do a seahorse tank. I keep reading that 30 Gallon min. Question I have would a 25 Gallon Cube with a 15 gallon sump be ok . Also there would be a AWC system set up changing out a 1 plus gallon a day if needed. The tank would also be a Marco Algae with a few Gorgonian corals. Reason for this size is my space is limited and will sit next to my Redsea reefer 250 SPS dominate.