I have a 90 gallon for my baby dwarf caiman and I am putting a seperator inside so I can put a strong filter system in. Right now, I have two submerible filters but they are not doing the job anymore. I have put a 1/2" piece of plexiglass in making the tank 8 inches high with water and leaving a 4-5 inch are that is dry from top to bottom and 18" deep for whatever filter system I use. It will have about 35 gallons of water (about 46What do you guys recommend? Thanks for any help