B&K PET ShopAquarium Submersible Silent Aquarium Internal Filter 12 W, Fish Tank Powerhead with 1000 l/hr. Water Pump

The product is great from all aspects. Very good finish, zero noise, oxygenation (bubbling) is superb. Although no user manual included, but all accessories are there, and can assemble it easily.However, this is the bad on my part. I bought it to replace a similar one from a different brand at 8w in 45cm aquarium, this pump 12w is so strong, it blew off everything in the tank and have to rescape it and use a temporary hangon filter instead. So head the warning: it's a 1000L/hr pump. Minimum a 60 or 100cm aquarium.

All good except opening it for cleaning is very hard I broke my nails tring to, one of the side clip has broke & since then the pressure is not good, even if i try to push the pump down, the bottom filter will get clogged by the substrate underneath.