[Replacing canister filter]

I hadn't thought about checking the dimensions either, but was pleased to see Seachem has published 17 dimensions for each of the Tidal models complete with illustrations: 

Tidal 35: https://seachem.zendesk.com/hc/en-us/articles/360022289213-FAQ-What-are-the-dimensions-of-the-Tidal-35-

Tidal 55: https://seachem.zendesk.com/hc/en-us/articles/360022281153-FAQ-What-are-the-dimensions-of-the-Tidal-55-filter-

Tidal 75: https://seachem.zendesk.com/hc/en-us/articles/360022289533-FAQ-What-are-the-dimensions-of-the-Tidal-75-filter-

Tidal 110: https://seachem.zendesk.com/hc/en-us/articles/360022289693-FAQ-What-are-the-dimensions-of-the-Tidal-110-filter-

[5 gal betta tank]

 

On 11/4/2020 at 10:59 PM, Grapevine89 said:

My other tank only has a small sponge filter with a beta I just started so I dont want to mess with that yet.

Maybe as your tank and filter mature your betta's fins will grow. 🤷‍♂️