I have two filters on mine, one 5g pressurized canister/UV sterilizer and a 30g rubbermaid container. 1900gph total and im so far beyond overstock when it comes to the bio load
well im running 900 gal per hour wit a fluval 303 cannister,aqua tech HOB filter & oddysea ex350 powerhead/spongefilter. im guessing that wont be enough for the 700 kiddy pool? i gotta tsn,redtail cat, p bass, & pacu!
You should be good until everything starts getting bigger, just buy some larger filters while they get bigger. You might want to look into a pond mesh cover as well so they can't jump out as easily.