To be honest, I would put that Interpet filter in the cupboard and get a different filter if you were to get that 10 gallon tank. The Fluval U1 filter would fit all the old media. The biomax would fit in the box in the middle of the Fluval U, and the sponge could be cut up to replace the foam sponges of the Fluval.
The Interpet filter would be useful for running carbon should you ever need to use any eg removing medication after treating sick fish.
Depending on how fast the flow is in the Spec tank's filter, it could be too strong for a betta. I use a sponge filter powered by an air pump in my betta's tank. But any new filter/media would need to be cycled before getting a betta for the Spec.
I do agree with you and I prefer foam filters for sure which is why I am so reluctant to change the spec. Everything is perfect about it apart from the size and everything is built in properly. Treating fish in my current tank is so easy all I have to do is remove the carbon and the filter takes care of the rest. Please could you send me the link to the fluval filter you are referring to? I will then purchase this for the tank and use my old media. Many thanks for your help.
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