Thanks for the reply, But I have already a canister filter That I use for my basking turtle setup , It will be too powerfull for a hatchling setup It has 400 gallon per hour flow rate and non-adjustable, I dont think if it'll be suitable for about 4" water depth.

Also, I have read many good things about an undergravel filter combined with a canister, but I dont like using substrate in the tank so I can see the waste better and heard at many forums that snappers are fond of digging and they will ruin the undergravel filter system as well as relaesing all the waste trapped within the grawel.

So I want to use good internal filters suitable for shallow water, till I can raise the water level enough for my canister filter.

I thank Gambusia for good idea but also in my country undergravel filters are very unpopular and there is no good brand even I am not sure if I can find a useless one or not..
So I'm still waiting for an internal filter advice.

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